4220 is a lot on weight to get moving, especially with a stock gear. I can see a lot of breakage in your future. At 3200 lbs.my .Barracuda 440 source pump gas 505 runs 10.30 at 130 with 4.56 gears . So if the calculation of .1 tenth per 100 pound loss your into the tens. My advice is to loose weight, change the gear to maybe a 4.10 if this is street / strip car more gear if strip only.