351w running issues.

1974, does it still have points in the distributor?

if Yes that's your 1st suspect, i wish i had a nickel for every time shot points sold a new carb. if you're not familiar with installing and setting points to achieve perfect 'Dwell' (feeler gauges can come close or hit the mark on accident but w/o a dwell meter you can't be sure they're set correctly) then get yourself an ignition points replacement / conversion module and install that. you'll have perfect dwell with no adjustments needed ever, never buy another set of points, the engine will run much better and spark plugs will last longer. the list goes on

is there a plate between the carb and intake manifold?

notorious for causing vacuum leaks either by the plate itself burning through or the gaskets crapping out. the lower gasket is a little special, it needs to be exhaust rated. a regular carb gasket won't last in that location

1st thing I did was unhooked all vacuum lines and plugged them off.

2nd started the car no change.

3rd spayed brake cleaner all around the carburetor noticed a small difference when spayed at the linkage.

4th took off the carburetor got it apart made sure it was sealing good noticed one gasket gone replaced it.

5th put it back together and put a new gasket under the carb on at this time I did notices a hole on the EGR spacer I don't think should be their(i didn't take a picture) but it shouldn't make a difference cause of the gasket. 

6th after getting it hooked all back up started the car adjusted it no change. I'm frustrated by now

7th I go get the new 2150 carb I ordered. get the old one off put all the parts I need off it onto the new put it together put it back on.

8th start the car at first i did notice it ran smoother but the looping was still their adjusted it and the electric choke kept sticking i tried loosening it it kept sticking now starting to notice a dead spot when i rev it.

9th put the old carb back together back on adjusted it now it runs worse with the dead spot now acting like it wants to die now with a miss as well as a dead spot and the looping sound i did spray around the intake and carb again no change at all I did notice a lot of blow by when I took the EGR valve out. car only shows 39990 and interior and exterior looks it but I'm stating to wonder if its not 139990 I got so frustrated at it i parked it cause at this point I think its the motor. and really don't have the means right now too tear the engine apart(i don't have a garage as of yet or an engine hoist or anything to tear the engine apart fully) and I really don't think it would be worth the money to put into it. I Dunno at my wits end

Might find more ideas here:

make sure you get the correct gasket for between the manifold and spacer!

FEL-PRO 60181 or equivalent, it's not the same as the spacer to carb gasket