Roller 360
Youngin, since you have the 90 block with the roller setup you can run a hydraulic roller cam fairly cheap. Your block will have deeper lifter bores with roller lifters, a set of dogbones to hold the lifters in place and a spider bolted to the center of the block that holds the dogbones in place.
I am currenty building a 408 stroker from an 89 360 roller block. Can't say if its worth it for sure but I have read a roller cam will make more power than a hyr flat tappet cam.
Comp Cams makes a line of retro-fit roller cams for small block mopars. I'm going with the 280HR-10 cam. Its about $300 for the cam and 110 for a set of new roller lifters. If your's are good you could reuse them but I'd rather buy new and not worry about it.
Good luck,
Steve