Roller Block with Magnum heads???

I've got two roller 360s. They can run with flat tappet or roller lifers. OEM style roller lifters are fairly cheap (I think between $150 and $200) and are supposedly good up to around .600 lift. If you have the dogbones and spider (retainer) then I'd definitely go that route. Use Magnum pushrods and Magnum heads and slap it all together.

As far as oiling, you're fine. OEM style roller lifters will oil through the pushrods. Most flat tappet lifters will too, if you use hollow pushrods. The block has an oil hole for LA style, but a Magnum head will block it off. No worries there.

Just be sure to buy a Magnum intake and you'll be fine. It's basically just like building a Magnum, but your front drive and accessories will be LA style.