I talked to Mike Beachel at B3 Racing today. What a wealth of knowledge, and one of the truly nice guys in our hobby. We talked for over an hour, starting with rocker arms and spacers, then delving into cams, ignition timing, how to solve detonation issues.
Some interesting subjects came up, such as he uses the same cam lobe manufacturer as Hughes Engines, among others. Mike touched on the HS rocker assembly, specific for TF heads for our SBM. He said that those rockers are not specific to TF, they're a copy of Edelbrock's rocker assembly. If I want a true made-to-fit rocker assembly, only T&D has them. But they're pricey.
We talked about cams and builds, I brought up your name
@James Clews, and he of course remembered you and the cam specs of your engine. Mike is a big proponent of a wider LSA for the street to broaden the torque curve and help avoid detonation.
I could go on, but bottom line is I'm going with his PRW bushed, steel rockers and spacer kit.