[scottj]

Joe,
I just spoke with Crower, sorry but they recently dropped the non-twist forging for the Ford, its got to be a billet. You probably have these prices but here goes: $1950.00 for std., $2250.00 for LW, and $2775.00 for UL. That's about $500 more than the non-twist was.
With the spring pressures required for that rpm any lifter will have problems on the street. You need to keep the rpm's up to keep the lifters oiled since they don't have direct oiling. My engines get new roller lifters and valve springs every year. Don't be suprised if it costs $5-6000.00 in yearly (1000 track miles) maintenance to turn that kind of rpm. That would be new pistons, rings, bearings, roller lifters, valve springs, hone, timing set, gaskets, wet mag everything, and inspect every piece. Don't do it and it's a ticking bomb.
Roller lifters will live on the street if you drop the spring pressure and that will limit rpm and make everything live longer.
Scott