That cam was used in that block with two different stroke cranks, 4.25 and 4.300, and five different sets of heads, ported big valve 906,eddy RPM CNC ported by MCH, a set of ported 440-1 and I ended up using a set of Indy SR M.W. heads. The 440-1 heads made 775 HP at 7000 RPM on Oregon pump swill and the SR heads made 725 HP at 7000 RPM on the same dyno two weeks later, both sets of those heads had 76.0 CC chambers so the compression ratio stayed the same.
The fastest and quickest my 3450 Lb. Duster ran with that last combination on Oregon 91 octane pump swill was 9.996 at 134.7 MPH at Woodburn, OR in late July
IHTHs