Great, Ken!
I cant wait 'till I get a crack at a GM TBI unit, Ron and others just rave about that one, of course you will have studied all about the epoxy fill in trick for that one...
I will add that on your Chevy pay attention to Ignition stuff, esp. if you have old or close to stock cap rotor wires & plugs.
Check the Ohm's resistance of the plug wires. If you might describe exactly what is in place on that truck now re; ignition parts and the ohm's of the wires, I can give recommendations. The really good ignition stuff does cost some$$ but is definitely worth it IMHO!
Ohm out the resistance of the longest plug wire and tell us what you find.
Ron's plug gap increase trick DOES work, but final results could vary depending on just what you have in place...
You may have your hands full on this truck right now esp. if you're gonna pull the intake for new gaskets. BTW Ron, do you have anything to add re; Ken's Chevy Intake manifold?
The Ignition stuff--all besides re-gapping--can wait till later if it runs smoothly now.
But trust me, If ya didn't Already Know, ignition upgrades can really get results along w/ all else!
Keep at it Ken, you're doin' Great!
Tracy G