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the motor is a 69' 302, so thats why i was asking about 331vs. 306, cause i know the bore is the same. someone told me not to bore it if i didn't have to. so basically like i said b4, i'm debating on 331vs. 306, but on the other hand will just honing the cylinders and keeping the btm end, w/cam...

i'm currently restoring an 86' mustang and the first step is the motor. i'm wondering whether or not its worth building a 331, or just to go with a 306. In your opinions what would the hp difference be between the 2. Also is that a practical build if the car is going to be driven not a daily...