this is awsome. i have a story for you. a friend of mines dad built a 79 corvette 350 30 over (355) vortec heads, flat top pistons (10.0:1 compression) 750 q-jet, all stock ignition, 3.73 rear gear. this story isnt one of those i new this guy that new this guy. i actually rode in this car. at a stand still this car jumped out of the hole. then we proceeded to go down town by highway in a 55 mph zone we were doing 60 came up on this car and slowed to follow i was just along for the ride but i had a feeling he was gonna pass this car. yup he did i looked at the speedo just b4 he punched it at 55mph we were what seemed instantly at 80 mph and it set me back in my seat like the seat was pulling me in. just a story. but if u start doing head work just like i tell every 1 check the price of the work then check the price of the vortec heads. oh yeah he used that extreme 4x4 cam dont know the numbers but that car had an awsome thumpy idle and went like HHHHEEEELL666