the motor will handle 175 if done properly. as for gear yu will want the tallest gear you can get away with. assuming the motor is stock bottom end 4.11's would be a good choice.3.73's are good for everyday street use , the 4.11's will give you better performance at the track. as for timing, it depends on the motor. i would start at 10 or 12 and work from there. i set mine at 13 and run a hot plug for my 150 shot. the timing should be set at total timing though. not initial. a good start is 34 total. two things i see wrong with your setup are the carb and fuel system. the carb should be at least a 650 for those heads and that much juice. and the holley blue will start to fall short on feeding both the engine and nitrous at mid track and up. a bigger pump or even 2 holley blues would be better and save your motor. you would most likely pick up some time just on the fuel and carb change alone. i that little pinto you should be in the 11's withno problem.
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