My old 540 with 440-1 CNC 345 heads was a copy of a 875HP motor and was only 13 CR.
HardcoreB, The only other significant info on my old (2015) 540 CID was the Best Machine spec cam 279/290 112 LSA and 1.65 T&D paired rockers. About 0.777/0.750 lift. The car ran a Ron's Flying Toilet alcohol injection. I loved that injection. Nothing fancy.