Don't be surprised if that manifold gasket turns out to be a cracked manifold. If you find a poly in a boneyard it will almost always have a driver side exhaust manifold but the pass side is almost always gone.
Bruce Toth makes adapter plates that allows you to bolt GEN3 hemi exhaust manifolds or headers to a poly. Anything would be better than the tiny log manifolds they came with.
.100" overbore and a 4.25" crank gives you almost 430 cubes.
