I had a 10:1 340 with ported 2.05 valves X heads. It had a 243@.050 hydraulic cam, 3800 converter, 3.91s and it went a best of 11.98@114 through a full exhaust system.

One of the best mods was changing to the larger intake valve. This was in the late 90s but if I remember correctly it picked up about .3 from the larger intake valve.