Dave,
Before you do, check over at the ShopTalkForum, under the "drag racing" and "forced induction" headings. They have had long discussions about this and you'll gain a ton of insight/info. You ought to check in at The Shrine as well. If it's the Gene Berg one that you're considering, go right to their site and email your questions directly.
They're very good and very honest. I was talked out of buying one of their cams recently . . . go figure . . .
Luck,
TC
>You seem to have the ear of one of the best around, maybe ask Mr. Raby what he thinks as well. Gather up all the info , shake well, sift , and see what you've got. I WISH that I had the money to ask your kind of questions/make your kind of decisions< :)