problem after 305 to 350 swap

recently swaped a 305 to a gm goodwrench new 350, i reused the good parts off the 305 replaced with new injectors with 350 injectors. my problem is the car lacks power when accelerating it almost dies, thought it could be a fuel delivery issue? any ideas? p.s. when i first bought the car i got a aftermarket prom.

Did you swap a 350 PROM for the 305PROM? If not, I'd wager the 305 PROM is not running the injectors enough.

Check your fuel pressure first though. TBI should be 9-13psi.