Dizzy recurve for 440 MH input

My daughter bought a 77 Dodge motorhome with a 440 and I want to recurve the distributor to help with power and temps.

My thinking is around 14 base and 38 total with mechanical. Mechanical starting around 1200 and all in by 2500-2800

Additional Vacuum adv of 14 for 52 total.

Input ?