IMHO, the OP’s setup is okay with the 901 type springs that the cam calls for. But going with upgraded 1.5 rockers (and by that I mean good quality stiff rockers with consistent ratios) and geometry correction won’t hurt anything. There’s some talk about a different engine being built, so if swapping these heads and rockers onto an improved short block are part of the plan, I say to go ahead and upgrade and have that much out of the way. But I would probably be looking at saving up for a little better rocker than the SM/ProComps. So, what are the plans for an upgrade? Oh, love the calculations that show exactly how much extra clearance that they increased ratio rocker will use up. I’ll be needing to use some of those myself for a nice solid cam upgrade. I got a set of used SM steel 1.5 rockers, so I’m going to get find out how those work on some factory 976 casting heads.
