small block 68 dart 4800 stall 727 4.56 gears car weighs 2700lbs.runs 10.60's gone as quick as 10.42. 60's avg1.47,1.48. what to do to make it quicker. also has 1-7/8 header w 3-1'2 coll. and 6 cyl torsion bars coil overs and ladder bars thanks