Honestly, I think everyone here is missing the point...a mild 150 shot of N2O will cost in the neighbor hood of $450 to $500 for the kit and can be installed in a stock motor in an afternoon.

My 440 bracket car went from repeatable time after time 12.00 to 11.53 with one shot. Granted everything else I did to the car and the motor (4.88 Gears, Loose Converter, Solid Cam, 850 Holley, Electric Fuel Pump System, 13x31x15 M/T Slicks) made the system work on a sloppy build 440 bracket motor (no blueprinting, no cc'ing the heads, unknown final compression with stock heavy TRW 2355F pistons, Mallory dual point distributor, low performance Accel Coil). And this was in 1983. That makes the beginner NOS system the best bang for the buck. PERIOD.