If you check the hot rod parts suppliers there is a company that makes a universal motor mount for the small block Chevy that will fit many different frames such as Ford pickups, one of those would work well in the Buick. A rear axle out of a 1962 or latter Buick has the open drive line and will keep the bolt pattern for the wheels the same. You will have to fabricate mounts for the 4 link but the width is real close.
Keep us posted on the results and how you solve the problem of exhaust etc.
Jim Carmichael 55 Buick Special & 65 Buick Riviera GS
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