Lets add a little fuel to the fire
I just went to the world finals in texas from Idaho. It is a 1650 mile trip one way. I had my trusty lly towing my trusty LBZ. LLY has MPI standard twin kit with 30% overs. I tow on my 650hp tune. Was awesome till I popped a piston 90 miles outside of Ennis. SO, I had to unload the race truck, put a hitch on it, load the lly on the trailer and get to the race.
I showed up in Ennis, unhooked the trailer, threw on some drag radials and ran 11.8 to 12.0's on a 750hp tune. All of you are going, what the hell does this have to do with anything. Well, here it comes.
The LBZ has the Danville 3794 with a race cover s482FMW with 60% injectors. I made 13 1/4 mile passes, won the Super Diesel race and all was well. OH YEAH, I still have to get home. Put real tires back on the LBZ, Hooked up the trailer with the wounded LLY and headed back to Idaho 1650 miles away.
The moral of the story is this. With a combined weight of about 20K, the LBZ towed as easily as the lly. LLY got better fuel economy, butt the 1000hp capable LBZ "race truck" towed its busted ass home and never broke a sweat.
I have had several twin combo's on the truck including, MPI standard, stock vvt with GTX4202, 4294vvt with gtx4202, Danville 4294 with gt5533, Danville 4294 with GTX5518, GTX4294 with GTX5518. My current setup of the danville3794 with the 482 is by far the best daily driver, tow, spool up setup I have driven. The two GTX's made the most power, but I could have never towed with them without keeping rpm's above 2400. The 4294vvt setups I towed 1000's of miles with, but they certainly don't tow like the current setup.
There is not a setup out there that will beat the Danville 3794 twinned with a decent size primary for making power and being easily drivable and have towing capability.