Understood, the cam in my 434 is 266 or 268/271 @ .050 and .711/.719 at the retainers after lash with 1.7 rockers. The lobes don't have very aggressive ramps. My springs are an endurance spring from PAC.
Yea, Vic Bloomer told me about a 1.46 diameter spring that i can use on my Harland Sharps with a roller cam. I had looked around and nothing was made that would fit that i could find anybody made( needs to be 1.50 or smaller to clear) so i have a way now IF i go roller to do so without buying new rocker gear.
I also might use the cam that is currently in my 360( flat tappet 260/264, 565/565) and just buy 1.6 intake rockers for my HS gear i have. Its too big for what i have going on with the 360( but was on the shelf when i needed it) but would work just fine with the 418 and the extra squeeze.