Best I can suggest is use the MP guidelines as a starting point. Even with the magnum heads, they still suggest 50* while cruising even though it needs less timing under load. https://www.forabodiesonly.com/mopa...mopar_performance_instruction-png.1715175314/
If you have an adjustable can, use that first. Its easier.
Maybe Hoppy has some 360 magnum head references and experience. @halifaxhops
