mach 1 vs bullitt shocks/struts?

Actually you have it backwards. The Bullitt sits lower than the Mach. The only reason the Mach sits higher than the Bullitt is that Ford raised their ride height requierments. Don't confuse form with function. Ford didn't design the suspension of the Mach with drag racing in mind. They are setup for the street. Go to your service manager and brag about your ETs and see how fast they void your warranty The Bullitt was about 3/4 inch lower than a stock Mustang whereas the Mach is about 1/2 inch lower.