Honestly, IMO, your run is pretty good. Just out of curiosity I looked up the altitude correction factor, and your run at sea level (according to numbers anyway) would be 14.17 at 99mph. I had a 72' 360 with a 70' 340 intake, crane 224/232 .460/.450 cam, headers, 600 carter, 727 with a 2600 stall and an 8 3/4 with 2.76 gears, and I ran a 14.2 at 95mph at a 1200ft elevation. My 60ft was 2.2. That was right out of high school, I changed some parts and about 8 years later ran again. Same bottom end, pocket ported the J heads with new valvesprings, windage tray, LD340 and 750DP, 904 with a 2800 stall, and 3.23 gears. Dropped to a 13.5 @100. I went to 3.55 and didn't see any difference other than using more gas.