Would going from a solid lifter cam 268/272 to a 274/280 change converter stall speed? Foot braking off idle car was a tenth slower. Normally 1.44 was 1.54 this time out but air temp was hotter than normal, was 90 degree's air temp. The car did pull a lot harder in 2nd and 3rd gear with a better mph. The converter is a 10" NOS Turbo Action and flashes at 4800rpm on NOS! Thanks Matt