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Looking for opinions on a completely stock '63 t-bird 390 4-v motor vs a 351c or w. Would be used in a '67 Mustang. Any pros or cons concerning horsepower, torque, fitment or any other issues would be appreciated.
 

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someone will correct me if I am wrong but I beleive the early blocks were drilled for a 2 bolt motor mount not the 3 bolt of a mustang
 

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Tbird exhaust manifolds won't work, and the early heads did not have the bosses so that you can drill and tap them for Mustang exhaust manifolds. That leaves you with conversion headers as the only option for exhaust.

Unless you replace the heads....
 
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