Quote:
Originally Posted by 2blu442
Yes it would. Externally it's the same as a 455 so if you use the correct motor mounts and exhaust manifolds it should fit just fine. John
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First, simply use the motor and frame mounts already in the car. If you buy 455 motor mounts, you'll need to change the frame mounts to match. If you keep the 350 mounts, the motor will bolt in with the 350 frame mounts. Olds motor and frame mounts are dimensionally equivalent if you use them in matched sets, but don't mix and match - they won't fit.
If the trans is out of the same full size car as the 425, it will almost certainly be a long tailshaft TH400. It will fit in an A-body but will require a custom shorter driveshaft. Your current crossmember works fine.