ok, would like my truck in low 13's high 12's (mid 12's if possible) i have decided to go for the radix system on my 5.3. is this a good choice? what else do i need to get it down there i already have a "super 40" flowmaster (3"in/2 1/2 out dual) and i just got my gibson headers in today. i also bought a shift kit and a corvette servo which will be installed this week. now my uncle wrecked his truck (99' obs) he kept the enigne and trans. they have 50k on them its a 350 with a 4l80e. he said i can have it if i want. he also has a 6.0 in his 2000 hd with 80k and he said i can have it if i give him the 5.3 to put in his. but my enigne only has 1,200 miles on it so i don't think its that good of a trade since his has so many miles. what do you guys think? if i use my heads and intake on his 350 would that be worth it? is that engine just like a Ls1 but cast iron? just wondering thanks for any input. (sorry for the long post)