no you dont have to pull the intake or heads to put in the cam. the lifters stay up and do not drop into the pan. it is a really simple process.

as for beleiveability, he ran 10.64 @ 124 through a TH400. yup the car is way light and hooks damn hard. (1.3 on the jug). my TA is a very boring example of a bolton with a cam but my raceweight is a sick 3590 lbs. ran 11.59@ 116 (1.51). and i am not even close as radial on the boltons or setup. bolton no camed cars are running as fast as my car.