For those interested in Polys, check out what all they do at Chrysler Power magazine bunch. They have lots of potential if you want to spend the and be a little different.
Allegedly the blocks are thick-wall castings so they can be bored over quite a bit more than later engines... combined with SBM 4" stroker cranks you can get a lot more than 318 cubic inches. But then of course the heads will need some work to really support it.
