I agree with Michael,
since the car already had a 351W installed, stuffing in another 351W makes the most sense and least amount of headaches for you. Ford Racing has a 351W crate motor, 392 cubic inches, 430 bhp/450 ft-lbs, $6800 USD. Jerry at PI raises the ante with 427 cubic inches, >500 bhp and $10K USD. Just too simple to drop one of these 2 motors into the car in place of the dead motor.
your friend on the DTBB, George
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