Originally Posted by oldbogie
A 1994 would have computer managed Throttle Body Fuel Injection (TBI). These are mapped in a PROM chip specific to the engine size and vehicle configuration. There is a lso a high probability that the injector size (flow per hour) is different. Basically this is a way of saying that a system programmed for a larger 350 will overfuel the smaller 305. Not to say there are other issues but this is a big one all by itself.
you are correct.. bigger injectors and different prom.. iirc same ecu..
shouldn't be all that hard to find a 94 truck/van with a 305 to grab the prom and tb