Doug i suppose you already know that you will need .180 offset lifters. i have Brodix 10 FP, RP's with 2.150 (tit) valves and T&D rockers mine are offset .250 and i have to use the .180 offset lifters. I think the rockers are offset .750 on the 18* heads. I'd almost bet that Chad Speire could get them to around 400 CFM. O'h and the largest pushrods is 5/16" due to clearance atleast on my Brodix 10's. I've got .726 lift with 1.6 rockers, but my heads only flow 328 CFM @.600
Zip.