I guess i should have been more specific. The spfi engine came out of a donor vehicle, installed all new gaskets, swapped the intake manifolds and carb, and put the engine in the carbureted chassis.
As for the carb, i tore it down, found the plunger to be very weak and not sealing, the needle valve wasnt seating correctly, and a bunch of dirt all over the place. I just grabbed my other carb off the shelf and no issues so far. Thanks!