i have a 91 isuzu pickup
im rebuilding the current motor

it currently has a stock 2 barrel carb and i want to change it out to a better carb.... but i dont know a thing about carbs.

what should i look into? every site i look them up on doesnt list the speicific cars the carbs work on

can i get a 4 barrel?
and last can a carb handel a turbo? or too risky snice its not DFI?

any info will be greatly appraciated
thanks alot
MB