You don't HAVE to have a roller block to run a roller cam. Aftermarket stuff works very well in a non-roller block. Just can't run a factory type roller cam. Non-roller blocks have shorter lifter bores, and nowhere to mount the "spider".
www.cammotion.com Kip will fix you up.
My "Mr Nasty" cam is a roller, and I've had ZERO problems with it in a non-roller block.