is it all together and somebody said ran when pulled and it doesn't look like it's wore slap out and been sitting on the shop floor since jesus was private?
install it and run it.
you're 40 over on a 318, there's nothing for you to do that doesn't result in diminishing returns. maybe a different cam or gaskets or something but as far as the short block goes? there's money better spent elsewhere.
it's a stop gap, snap it in and