What would you build if limited to 372ci - with boost as an option

I could make a blow through 383 live on 18psi with c16 no problem. And I think it would make the power you need. I wouldn’t rely on any electronics to yank timing. Run a locked out distributor and it will be fail safe. You don’t need a curve in a bonneville engine. In fact you need to dump off some torque so it’s beneficial not to have optimal timing at peak torque rpm.