Skylark,
Good luck making it fit :mad:
You'll need GS specific oil pan( rear sump)
GS specific motor AND frame mounts
GS specific exhaust manifolds
GS specific radiator
The engine wont clear the suspension without the rear sump pan
The exhaust manifold wont clear the firewall
The motor and frame mounts are completely different( you can make these- lots of labor)
The radiator has completely different tanks
the lower hose goes in the drivers side
These parts were changed by BUICK
to build the GS in 65&66
The Gs parts are interchageable
Take it from experience( 401 in a 65 sportwagon)
You'll need to find some of these parts to doo this swap
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