That's a pretty good question, i've been wondering the same thing. i've been running comp-cam lifters, but have 2 sets of used lifters in good condition. (1) crower and (1) isky red zone, one of these are going in my in my 434" motor that's on the engine stand, that is if they will work. I'm not sure if they will because i have a set of brobix 10 rp's and may require offset lifters. In fact i'm not sure what rockers i can run yet, and Brodix can only tell me i have to run offset rockers but can't tell me how much offset i need. It's a fit together setup and i guess i'll know when the new head gaskets come so i can finish the assy.
If i had the money i would go to the larger .875 lifters because i know they would be better due too the larger roller.
Zip.