Roller Block with Magnum heads???

So I have a 53006921 roller block, and I am thinking about putting 53006671 Magnum heads on it. But I have been reading some differing ideas on the roller block. These are things that I may or may not have to think about for this build. I am not sure if it is a 90 block or a 91 block (casting stamp reads 3 10 90) March/10/90 or 03/October/90? Long or short oil filter boss, proper length camshaft for oil pump eccentric, can it be easily converted to flat hydraulic lifters ie; are lifters longer, can i get longer oil through lifters, or should i stick with roller lifters will they work with the magnum heads? It seems like it would be a decent motor if it can be built. Or should I just find some LA heads, better yet are these roller blocks just a headache and best used as an anchor?
PS I can also have passenger side exhaust manifold off of the 93 dakota that the heads came from, will this fit on abody cars?
Thanks again for all the help? If no one has yet done this build and I go through with it I'll keep you all informed.