My 66 mustang has a 76 model 302. Ive put early mo 351 heads on it.Used the 7/16 head bolts that were on the 302 orginally with hardened washers under the heads of the bolts. The 351 head bolts are 1/2 and wont thread into 289/302 block.Ford Motorsport
makes a special bolt just for this for about $75 a set if you wanted to go that way. I used intake gaskets for the 351. However since the 351W block is wider the 2 pieces that go on the front and back of the intake(the small cork parts) came from a 302 intake gasket set. Everything else was a normal swap.
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