Are you stuck on the TBI? If so, then get the injectors from a 454. The 305/350 units will be borderline at 350hp.
Computer- Stock? Try a reflash once you get your combo details sorted out. You might consider a Megasquirt install if $$ permits.
? about your heads- try to find some late model Vortechs off of a truck (or even new- they're cheap). VAST improvement. These will be instrumental in getting to 350hp much quicker.
Cam? Find a Comp HE268 or 272. Your stock converter will love it. The TBI would run out of gas at high Rs anyway, so cam it for a useable 1500-5500 rpm range.
Dizzy? DUI or one of the many HEIs; it will work with your TBI without any signal adapters.
waterpump- get a good Edelbrock alum. They are very nice &fit very well.
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