slant cam guessing game...428 lift?

ICL would be 108 only if there was 4 degrees of ground in advance or was installed with 4 degrees of advance. Yours looks to be installed 4.5 degrees retarded..... perhaps you are using an old, stretched timing chain?? You sure need to fix that and get 4 degrees of advance.

Your cam is like one step below the Dutra torque cam I installed:
208/208 @ .050
.290/.290 cam lift.
LSA 112.
-16 degrees overlap at .050, or 20 degrees advertised overlap
Grind # MFT6112-17 (Oregon?).
Lash specified is .020/.022.