What kind of spring pressure are you talking about? I don't have Indy heads (mine are Edelbrocks), but I have Comp solid roller lifters in my car. My cam is a small solid roller, spring pressure is only 185 seat 465 open. I have had no issues with mine, but my spring pressures are not too crazy with my small roller.
The reason i said indy heads is that they are .800 offeset and the angle that the pushrods work on are insane, pushing sideways, especially with big lift, and i think that is the biggest problem with my engine.