from the knowledge base link at the page top:
here's about 50 383 combo's with published dyno #'s (and a bunch of 350's)
you don't need to go $$$$ stroker and roller for 400+fwhp....
Edelbrock Chevy 350 "RPM power package" is 410(fw?)HP with a flat tappet cam....carb/intake/heads/cam "bolt on".....HP peak at 5500