Talk to Dwayne at Porter Racing Heads or give Brian at IMM a call. Both guys have experience with BB Mopar hyd roller setups.

I've run a few hyd roller cams in BB Mopar engines and it can be frustrating to get the cam lobe, lifter, rocker arm and valve spring all happy together. If you get it wrong the lifters will stop working early and the power goes away.

You shouldn't have much trouble finding a nice hyd roller cam but the lifters can be an issue. I run Comp lifters in my street car and they work just fine but there are guys who say they don't work. Morel has lifters, but I think that IMM uses Gaterman for their hyd roller lifters.