Sounds pretty similar to my set up. M1 with lightly ported eddy heads and 625 solid roller. Started with 4.10 and went to 4.30 gears with 8" 3800 converter. Big help came (.3) when I switched from 950 to a 1050 4150 quick fuel. If you don't already have the 950 then by the 1050 right away. Your car is lighter than mine and probably a bigger tire (mine are 275-60-15)and I weigh almost 4300#. You may crack into the tens since mine is 11.15 on super stocks. Good luck and be carefull overseas. Thank You for your service!!!!!