5.7 0r 6.1 with msd hemi 6 and carb

Steve

I assure you that +39 degrees on a 5.7L, ANY 5.7, is folly.

I've tuned plenty of high HP N/A 5.7L/6.1L and none have produced appreciable hp too much past ~30 degrees(w/ 110 octane)

You are either overlooking the signs of detonation and/or running an excessively RICH A/F.