Howdy
Welcome! It's all here for your trucks.
In my opinion, the only route to go for REAL power gains for your rig is a turbo setup. I have M1009 and it is non-turbo. I have done just about everything that can be done to it(easily) except the turbo. It has open exhaust with long tube headers, custom air intake system with ram air, open plenum intake, newer injectors and increased fuel flow. My neighbor has a truck identical to yours(tire size and everything) and he put a Banks turbo kit on. His truck will walk all over mine...no competition. Gearing has something to do with that....but the turbo is the main thing. He has used his to pull about 12,500 up into the mountains of Colorado and as long as he was driving within limits and watched EGTs he had no problems. That being said...he is now in the process of building a cummins.
I have allot of experience pulling loads with the M1028s and they always did what they were supposed to do, just not fast or fancy.
There are allot of things that you can do to your truck for free... I would start there.
Open up the exhaust, increase your air flow and turn the fuel rate up just a little...see what you think. If that doesn't make you happy then go the turbo route.
The newer 6.5 with electric fuel pump would not be an option to adapt to your truck. The turbo off of it could be used to make a turbo system but not easily. If you have a mechanical fuel injection 6.5 then it would be an option to swap that into your truck.
Use the search window on this forum and you will find TONS of great info.
Hope this helps...
1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
2001 Chinook RV, V10 gas
1974 John Deere 1530 diesel tractor
1993 John Deere 455 Diesel lawn mower
1967 GTO, 1989 Honda Transalp
2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
1998 6.5 suburban, stock, daughter's
1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's
1984 6.2 ATS turbo 3500, SCDWLB - Son's
3 kids, 1 wife, 1 dog
Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!