I have some 799 heads I plan to use on my 5.3, but I dont know what to do to them. I was thinking milled .40 and 3 angle job, along with bigger valves. Any suggestions, or advice would help. Currently truck has 212/218 cam, tb stall, headers, 3" full exhaust, ud pulley, tbss 90mm intake, volant air intake and nitrous. I want to use the heads with this setup first, then i'll eventually get a cam and stall to match the heads.