I'd go with the easiest bolt in swap you can do instead of opening a can of worms. Don't fix what isn't broken. Drop in the new engine and sell the rest on ebay to finance the job.

You'd have to have a driveshaft made, etc., etc.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)