351w heads on 302

I was going to put 351w headers on my 302 but am a big short of money. so i was wondering how much of a difference it will actualy make? And if i should go for it or just put the 302 headers back on? thanks

It'll make a big difference if it's an early 302 - it'll kill compresssion and knock the torque out of the motor. If it's a later 302 with big chamber, it'll probably make no difference at all.
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i would just mill the 351w heads
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