Hughes Roller rockers or my current?

At no more than a 150 shot. You'll be fine with a properly build lower end. Forged not needed. But everything needs to be set up properly.

For your viewing pleasure. Check out engine masters first season episode #13. Free on Netflix's right now. They talk about this very thing. They run cast piston Cheby up to the grenade point on Nos.

Or a short version on the "U" here.