what carb? for holley strip dominator.

Yeah if you're not pushing at least a near max effort drag combo the Strip Dominator will be a negative to the combo rather than a plus. low and mid range drivability will suffer badly. the Torker is no joke either, it doesn't get out of bed before 3500 rpm and likes a lot of stall and plenty of gear for breakfast. between the 2 of them, the Strip Dommy and the Torker they are the #1 & #2 top of the heap racing intakes from back in the day, and not much has changed in the US since then. the Aussies have gone a slightly different route with their 3V porting but unfortunately their is no standard port location between manufacturers. some are compatible with 4V ports and some are raised higher then the 4V port roof. here's a pic of a Parker Fynnelweb and how it meets the 4V port opening

it can be run as shown above (creates a nice anti-reversion step) or with the port floor filled with an alloy cast 'tongue' or epoxy. epoxy is still used for installing the tongues, and a small bolt is run up from the bottom to help secure it. the reduced cross section 3V port helps tame the 'single plane 4V blues' w/o hurting performance at all, usually improving it

how mild is your combo? don't underestimate the Edelbrock Performers!

all Performer intakes use smaller than head opening port runners to improve intake tract velocity, the Airgap IIRC is standard 2V size but the flange is large enough to seal on a 4V head and the intake really delivers. they did their homework developing the Airgap for sure

FWIW i'll never curse myself putting a Torker on a mild build again, certainly not a Strip Dominator if i ever have one. i'm almost tempted to trade you my Bluethunder but i have no use for it, i have a D1ZX-FA intake and a 750 Dominator carb i may never use already. back in the day on my 1st or 2nd Torino i went through all the steps upgrading my Cleveland from 2V to a 4V headed dual quad tunnel ram for daily street use. i had the most fun driving it when it was a 2V headed stock 2150 2bbl and Comp 268H cam. cast iron log manifolds and glasspacks, stock converter and 2.75 gears. coulda used a little more gear but not much, 3.25's would've plenty. so anyway a 2400 stall and 4.10 gears was not enough for the Torker to enjoy life, it wanted more stall ... then it would've wanted more gear i'm sure. they're Honey Badger race manifolds, they DGAS what goes on below 4k rpm

does your blue thunder have the heat riser?

i also have a boss inatke but its not square bore so cant used it 

i just remembered i have a 4300-D Offy Dual Port that has had the same (almost) treatment. somebody did the 4150 square bore clearancing but left the divider intact the opposite direction to preserve the Dual Port function of the plenum, with the primaries and secondaries both notched for improved flow. a little rough but who can see through a carburetor? intake came with a dis-assembled motor i picked up locally

FWIW i tried an Offy Port-O-Sonic for a bit, it seemed a lot more streetable than the Torker but still single plane, and i had a 10" converter and 4.10's so IDK?

a good 2 plane will carry to 6500 rpm w/ no low end issues.

and there is a proper adapter plate to convert 4300-D spreadbore to square flange ...

https://www.summitracing.com/parts/trd-2199

leaning towards the blue thunder 

sweet any leaking issues?

i almost forgot the Scott Cook / SCM Engine Developments 'factory appearing' intake manifold

http://www.scmenginedevelopments.com/manifolds.html

it's actually 3V internally similar to the Funnelweb i posted above but obviously in a 2 plane design, and everybody says it Rocks just fine or better than the full dimension stock sized 4V port intake. don't forget to convert Au$ to US. tricky tricky

sweet thanks for the tip on the gaskets, i think that is also a problem with my intake now it leaks.

the BT are available now $500-$600 shopping around for best price