the only real diffrence in price is the block and intake even if you have a 302 you need a crank pistons rods etc (to go to 347) a good 351 from the wreckers for $50.00 more you have a better starting point same heads throttle body injectors diffrent headers but hey you would upgrade with the 347 right. the distributor is the hard thing to find . i also have had luck porting a 351 lower and going with a box upper.
you also have your 302 still
just my $.02 bill
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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