Again I have the same question...
Would you take a used stock bottom end 360 and put thousands of dollars of heads cam converters and gears and drive it back and forth to the track expecting it to do elevens for any amount of time? I'm fully confident it might do it once or twice but for season after season? Reliably being able to drive it afterwards and before?...
going 55 mph down the road will not require any more HP or stress to the motor than what is being applied now. Converter and gears will lower the ET, so not all the dropping of the ET will be on the motor.