76GMC, I appreciate the comments on compression ratio. I'm trying to keep it down but there is not much of a selection of pistons with a greater than 18cc dish (64cc chambers) - unless I drop to well below 9:1cr. So I am going to use a D-cup dish, an .039-.040 quench, and polish the combustion chambers in an effort to reduce potential detonation. I'm also trying to use as thin a head gasket as posible to reduce the deck to head gap for carbon buildup.

I found an upgraded spring and retainer kit from Crane that increases valve lift clearance to ~.520 on Vortec heads without machining - this option is a little less costly than machining for larger springs and replacing seals and retainers.

Both of the Comp Cams I listed are in the grind families you have mentioned, though the LSA's are at 112 and are intended for use with ECM controlled engines.

I will get Comp Cams on the phone next week to see what they advise and will pass on what I learn to the group.