[blykins]

400 lb open pressure is nowhere near enough.....I wouldn't even feel comfortable with 450-475 for a solid roller.

For street rollers, I usually go around 250 seat and 550 open.

On a hydraulic roller, 150 lb seat pressure and 400 lb open is good.

For an engine never turning over 6000 rpm, there is no reason to not use a hydraulic roller cam. There are also plenty of grinds that will allow you to make comparable power levels.