Yep...another request for camshaft suggestions.

Sounds like a perfect candidate for a hughes "whiplash" cam. Made just for the low compression 318 with pistons in the hole.
If you ever rebuild, the work on the compression with pistons and deck height, until then, just send it with the whiplash cam ,lifters, and springs kit.
I have used the xe252h cam and liked it very much, but my pistons were only .015 in the hole and made about 9 to 1 compression with the smaller chamber 302 heads.