Just last year my 67 Satellite still had the original 383 130,000 mile short block in it, and its orig. 516 heads with stock valves. It was a 2bbl motor, so in the 9:1 neighborhood. Wearing a holley 750 and an RPM intake, with a Delta .496 hyd. cam and a set of used headers, it went 13.73 @ 101. I flogged that 383 to 6400 RPM, and it never missed a beat. held 40 psi of oil pressure until the day it came out.