You might try letting the clutch out under 3000 RPM to se if the car will bog or go My old 1970 NHRA A/S Hemi Cuda( a 383 car originally converted to the hemi drivetraiin and motor) would bog with 4.10 and the 1968/69 OEM 173 tooth heavy flywheel on a good track on 9x28 inch slicks. I had Bob Lambeck put a set of 4.89 ratio gears in the rear and it never bogged again umtil I put a 18 lbs 130 tooth aluminum flywheel in it I would have the old aluminum wheel surfaced to see if it would be useable agian or not