My original 512 C.I. pump gas low deck made 612 HP at 5600 RPM and 644 Ft lbs at 4500 RPM. It ran 10.69 ET at 124.6 MPH at Woodburn corked up with the air cleaner on the six pak. That was with me in it weighing close to 3400 Lbs. wet, corked up with the air cleaner on, 4.10 gears with 30 inch tall tires The torque converter can and does makes a huge difference on our cars I ran the car at Woodburn several times this summer, it ran 9.96 at 134 MPH corked up on pump gas. This motor made 727 HP the last time it was on a DTS engine dyno at 4300 Ft elevation in Klamath Falls, OR I broke my ten inch custom built converter two years ago, I put in a new T/A 8 inch race Hemi converter with no other changes, it made the car way easier to drive and race and pick my car up .2 ET and 2 MPH in the 1/8 mile