Just a 284-484?

I did a cheap 440 for a friends all steel '67 dart, stock bottom end, ported 915's, Street Dominator intake, 850 Holley. I used the .484" cam, stock rockers. Without even a jet change, it ran 12.30's at 108 on used dirt track tires with 3.23 gears in the rear. A switch to 4.10's got 12.1 at 110 mph. Shift point was 5,500 rpms. I never got to see a higher shift point tried, or any tuning done. There was a few tenths left just in the launch in my opinion. I figured an 11.50 car dialed in.