Magnum vs LA block...differences...preferences

What year is the LA Roller block from? I'd like to find one. Would that block be a good candidate for a solid roller build?
late 80's to 91 is the LA roller.. they're basically a Mag engine with block provisions for LA head oiling. And yes they should work fine for a solid roller, you'll have to use the taller race style solid roller lifters because the lifter bores are taller.