I have heard some good things about that TSP cam too. I just want to give you a heads up on the 5.3 Patriot heads running that much lift... We had fits with a good friends WS6 with a G5X2 cam and those heads... Patriot could not set the springs up correctly and after the second set broke, we installed the REV double springs in his stock heads and has been great every since. The customer service from Patriot wasnt great either. Patroit finally refunded his money but it still cost him nearly $300 in hardware to swap the heads out three times. I just wanted to let you know of the problems since the x2 and the tsp cam you are looking at are very similar in profile. (btw.. G5X2 - 232/240 .595/.609 112+2) I think the TSP would be a good choice but you are definately going to need a good size converter to get a heavy truck moving.
2000 Silverado, RCSB, 2wd w/ a few mods.
Best 1/4 ET: 12.09@111.22 (old 5.3L H/C/N2O setup)
WRE 370 and Kenne Bell 2.8L installed and breaking trannys.
2001 Tahoe LT 4wd
Stock, daily driver and tow vehicle.