hi have a fresh 451 in my 73 cuda,with a comp cams extreme energy hi lift hydraulic 285 241/247 @50.i put the motor together myself and fully rebuilt the trans with all good frictions ect,the car has a 4;10 rear and 26 inch mickey thompson street tyres,ptc done my converter i put down 50% drag and 50% street john cope said it was about 4500,4800 stall,the msd has 18 degrees initial and 36 total,the problem is you would think this car would hammer off the line,but it just revs alot and you dont get that thrown back in the seat type of feeling,i took the car to the track with this setup and it ran 106 for a 12.2 the car was at 106 with 100 metres to go and was just sitting on 7000 rpm for the remainder just doing nothing,i did 2 runs like this and realised i was being a dickhead and the exercise was fruitless,i havnt the money to buy gears at the moment however i have a set of 3.23s which im going to put back in for the time being,i also now have 28 inch slicks that i bought.can you have to low of diff gears and it just skips through the engines powerband,this engine gets to 6000 so quick without any real seat of your pants pulling power ,will it feel faster with the 3.23s on the street ,will it hold it in its torque band better?