73’ 318 dies under accel with new intake & carb

When you check and check for vacuum leaks and none are found, then the solution lies in the fuel distribution. I even hooked the smoke machine up to the engine and found no area for a vacuum leak. Many other people stated this carb ran extremely lean on their mild strokers.
Wow, I'm surprised that you need to go that far to make it work correctly. I know the Edelbrocks claim to fame is the excellent performance for street vehicles, but can be tuned for modified ones as well. Setting the jets & rods to max would certainly pour a lot of fuel into that engine. I am running an AVS2 on my stock 360 & have a 408 on the way from Blueprint. Hope I don't have to go as far as you did to make it work correctly!