It seems 10 psia is the standard for 10.5scr, with pump gas 91 and advance around 22°
Unless I get off the dinosaur juice and stalk the corn fields. Much more boost can be applied before predetonation
I can't comment, never having built a supercharged system.
But I do know that installing 2.02 heads on a 273 is normally not advised because of valve shrouding. With a Super, this may not be an issue. Your Commando Heads are sub-60cc items IIRC, so almost anything you bolt on there is gonna drop your compression,IMO, a good thing. Perhaps 62cc Magnums with 1.88intakes.
I would surmise tho, that a 273 at 22*total timing is gonna be a dog until the pressure hits. You gotta have something left to drive on before the Super hits, which might be something like 85% of the time. This is why in my dream I start with a 318; that's 45 cubes, and a lotta low-rpm torque. And also why dual turbos; the small one is working right from idle, making the combo perform like a 360 most of the time.
I think my dream could be adapted to a 273 easily enough.
