L31MaxExpress thanks for the info.The 0.560 is actual 0.527 with a 1.5 rocker and 0.562 with a 1.6.
I would use a 9-1157 Cloyes and set it in 4* advanced. Lingenfelter cams are ground straight up, no cam advance.
The Lingenfelter cams are on a steel core, rather than a cast core as well. No special distributor gear needed, just the old melanized Vortec gear.
I’ve had some guys telling me those heads and cam might be too much for the weight of my Suburban. It does have a built 4l60e to handle basically any hp/tq i throw at it, but has a 3:42, but I figured with a good stall it should compensate for that, but I could be totally wrong on all of this. I had a local racing engine builder tell me that this combo should do well, but the 68cc combustion chambers might not work as well as if it were 64cc with the 200cc runners. I’ve just been all over the place with this thing trying to figure out the right setup. The weight and the factory fuel injection is what’s giving me problems in trying to determine what is going to be right for this thing. The thing I built was a 78 El Camino SS with a carbed 355, back in 2004 before I had an accident that left me paralyzed for over a year. My spinal cord and brain injury gets the best of me when trying to figure this stuff out anymore.lol