Different engine, builder, parts, and assembly - but that's pretty much what my stroked 428 KC motor runs on 10W-30 Joe Gibbs
oil. About 20 psi at idle hot (900 rpm) and about 50 by 3000 rpm. I haven't watched closely to see where it appears the pressure relief is opening at but I think it's around 55 psi or so. KC has suggested I go to 20W-50 in the summer,