318 Motor, please help

FOR THE WIN!!!! I just got home, practically ran my wife over to head out to the garage and try this out. i pulled off the breather with the hose attached, crewed on a basic oil cap for now and plugged the hole on the back of the carb. fired it up, dropped it into gear without even letting it warm up and it stayed running!!! now i know there has been a vacuum leak this whole time so all my tweaking has been for not. now i can start all over and get this bad boy running strong. i cant believe i didn't think of this. i'll be going to NAPA tomorrow for a PVC valve. Thank you Bobzilla!!! Thank you everyone else for the help, ill keep you posted. and no.....i wont get rid of my Holley, i think they look 10x better than the Edelbrock and much more tunability.
Welcome to the site !!! As you already can tell, many here will post what's not their personal preference as the problem... LOL. I've owned (and currently own) eddies, Holley's, bbd's, and all of my cars run really good. I'm glad you found the fix, that is always fun and rewarding. I'll throw out this, though, you might even like it better if you go up on your power valve.