My 440 is 500" 9.5-1 compression spin it to 6700. Makes over a 1000 to the tire at 18 psi and 20* timing. still holding strong.. pretty much a stock block with a girdle..

67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials