Well, to be honest, I don't like either of those cams for your combo. You have a tight low rpm stall converter with 3.73 gears and probably a 31 inch tire I'm guessing. You need more power down low to make your truck quicker. I wouldn't jump on the big cam bandwagon if I were you, I'm pretty sure you'll be unhappy.

I think I'd recommend the high lift trucker cam from Vinci. The 8 degree split is known to work well with PD blowers and cathedral heads. The shorter duration will make more power down low. The higher lift will take advantage of your ported heads(comparing to the regular trucker cam).

With good tuning, my 5.3 with a similar setup made around 600 rwhp.

 

Probably more... you left some MPH on the table short shifting it.

The specs I mentioned are very similar to the trucker. Intake is on the same centerline with only 2* more duration so the valve closes just 1* later. The exhaust has just been brought in closer to TDC. The cam I mentioned actually has the exhaust valve open 1* later than the trucker, but keeps it open 3* closer to TDC. Its very similar. It'll give you more chop, and if anything I would actually expect more mid range power out of it. With good heads you can take advantage of having exhaust close and intake open closer together. -6 overlap would give you decent chop, but its enough that it wont overbear the blower, or make for an obnoxious idle. Not that there's anything wrong with the trucker... it would be at the top of a very short list if I were camming a 5.3 with a PD blower, but I think it was spec'd with less boost in mind. People werent pushing things nearly as hard back when that came out. When you spin a 112 as hard as I think he is willing to your bottom end becomes absolutely ferocious and there's almost nothing you can do to prevent that. More cam will only help the mid range and top end power.

I'm curious what your converter actually flashes to. I have a yank 2800 and I flash about 4k with my combo.

I'd also like to see a time slip of the current combo.