Below is a list of parts that are different between the 351/302. Someone correct me if I am wrong..

Flywheel
Harmonic balancer
Intake manifold
Exhaust manifolds
Exhaust Y-pipe (it is wider for the 351 so you may be able to modify it)
Accessory mounting hardware. (anything that bolt to the heads.)
Computer (some say yes some say no)


From what I have read the 351w has allot more torque, but gets about the same gas mileage. Providing you are nice to it. I say get the 351w rebuild... But I can understand that you have a good 302. You have all the parts needed for the swap(providing both have auto trans), so it would not be that hard or expensive.

Good luck..

Doug