318 LA roller block questions

That would be a great 318 block ro build. It's setup for the roller cam and used the oil thru the block to the rocker arms. You can use any head you want, la or magnum. I say you got it, build it.
Btw you can test the block to see if it has the meat in the cylinders to go 4 inches. If so you can use the 360 stroker piston and the 340 4in crank for a 402.