Forgot to add some other detail info:
My intake manifold is the new INGLESE version that has a huge built in common plenum... The intake runners are individual - but they have a (approx) 1/2" hole leading to the common plenum (they would have little if any reversion thru these). The EZ EFI is also BATCH FIRED. It doesn't require the dual sync distributor (a HUGE PLUS IN MY BOOK)... it just runs a normal distributor... so once you set your timing - just like you would with a carb - you're done. That is assuming you know what you're doing -- and have the advance curve - initial timing - and total timing dialed in. We did this on the engine dyno before I stuck the motor in. Every motor is different -- but this one took 32* total to make best power.... normally I'd have been up at 36* and trying to go more... but the new heads etc just liked 32!
I really like this new manifold because it gives you a good vacuum source for PCV - or power brakes - and for the vac referenced regulator that is REQUIRED. 8 stacks are NOT good sources of vacuum.... since they normally lack the common plenum. If you don't have a common plenum you have to fab one up with some plumbing etc to get a signal from the individual stacks to a common source. That's usually "ugly" and just another source of leaks down the road etc. I really like this new intake! Super simple "fix" for a common (pun intended) problem.