318 Poly will not fit.
the 273 was designed to fit the 1963-66 Abody,
it was based on the too wide old 318.
sell the 318 poly, and find a newer 318.That will fit without much problem.
Is your car an automatic?
http://fox302.com/index.pl?s=vf&use...cavemanmoron&file=crankspacerinfofrombook.jpg