Matt167,
This discussion started out being about a 383 in an '89 Suburban. It's already TBI. The links I provided in an earlier post are to forums for GM full-size trucks. This isn't virgin territory. Been done hundreds of times. You don't have to figure anything out for yourself. Just ask those who've already done it.

Nothing inherently wrong with carbs. They've been around forever and have even seen some modest improvements in recent years. But why go backwards? He's not building this truck from "scratch". It's already EFI! It's already set up for an in tank fuel pump, a fuel return line, a fuel pressure regulator, etc....

Anyone can do whatever they decide is best fort their vehicle, budget and ultimate goals. I just wanted him to reconsider converting to a carb. Why not have the performance, driveability and mileage that EFI offers when you're already 3/4 of the way there. I'm sure the truck will run like a scalded ape either way and the owner will be happy.

BTW, the resale value is gonna be hurt by the carb conversion, too. But that may not be one of the owner's concerns.