Im getting the 1.84'* from zzp (same as the yella tella'*) for a few reasons
no risk of valve float
no springs needed (less install, and stiffer springs wear on the drivetrain quite a bit more)
cheaper (then roller 1.9'*)
the gains are more then reworked 1.9 stockers, no deflection, no valve float possibility....the roller 1.9'* would give more lift (i believe they're about 2hp more, plus more timing advance, so they'll wield about 5-6hp more) but the install is more expensive, time consuming and more wear on the engine.
modded & dropped 95 Aurora - SOLD for a 2001 Alero GLS - which is now being sold for a 93 SSEI WHICH got sold for a modded 98 regal GS!!!
98 regal GS:
3.4 / thrasher intake / SLP powerflodual exhaust / 3-2.5" downpipe w/ highflow cat / DHP 1.0 / afc 2.2 / gmpp handling package / other small things