Awww man that was my idea! J/K That sounds great! I love those HD's and was thinking a 1500HD crew cab with a 6.0L STS and 4L80 would do the trick, but your idea is better. Is the LS7 high compression? I think it uses the C5R heads so it might be fun to build one. Not your run of the mill cheap build but I'm sure that is not what you are going for.
Jeff
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning