Does my 451 have to small of a cam?

What do you mean by slow launcher??Unless you have monster tire on it you should be able to fry the tires at will and launch hard. Your power to weight ratio should be excellent as the 440 Duster I had weighed 3300 lbs with my fat *** in it.

In fact, I had trouble getting the car to hook up, streets tires were a joke as far as hoping to get traction. Your package should easily make 400 plus horse power as a stock 1970 440 six pack motor had 390 horse and I think close to 480 lbs of torque and was strong enough to move a much heavier B body 13.00 flat(Ronnie Sox "Mr 4 Speed" in 1970 took a bone stock B body six pack 4 speed car and managed to get it to turn 13.00 flat.

Put a vacuum gauge on it and if it doesnt go to or near zero at wide open throttle you probably dont have enough carb. With 3.91 gears if you have about 26 inch tires on it you are probably at 6000 rpm (or more)at 120 mph thus your lack of a big top end.. 750 double pumper or vacuum secondary, possible bogging accelerator pump may need adjustment.????? With what you have you should easily be running in the 12's at 110, are you anywhere near that??

As far as the cam making the "big power sound" the cam doesn't have rock the car to make power, for example 327/350 horse chevy small block cam only had .447 lift. I don't know that the mopar 340 cams had a whole lot more than that. The old 409/425 chev motors didnt really have that "big cam" sound either.The best street cam I ever had was right around the same specs as the one you have. Start with one system at a time and troubleshoot it till you get it dialed in. If you have deep pockets take it to a pro who has a dyno. You might consider a little looser converter say around 2500.