Well that will be good since my axles are 3.54 and if i go this route will use the T19 that is matted to these. This would leave me needing to buy the adapter from T19 to series Tcase.
Something was bugging me about the info I posted above so I went and starting digging around the books in the shop...
In 1980, wide ratio T19 (6.32:1 first) came with 3.55 gears. Close ratio (4.02:1 first) came with 3.73.
The SD33 Turbo made 101 hp at 3800 rpm, 175 lb-ft at 2200 rpm. Boost was 6.5 psi. The engine had oil squirters for the piston skirts and the bottom end and cam was enlarged with larger journals.
The previous non-turbo made 81 hp @ 3800 rpm, 138 lb-ft @ 1200-1600 rpm.
The engine was originally setup to run on 3.55-3.73 axle gears with stockish sized tires so I wouldn't worry about re-gearing or anything.
The engine itself might be interesting but I wouldn't spend "real money" to buy an engine with such lacklustre output personally. It's just old at this point. If you are going to run old stuff then stick with what you have unless you can get a good, known well running SD33T for only a few hundred bucks.
Also, IH is notorious for having "non-standard" mating surfaces between transmission and transfer case. Verify that there is an adapter to mate the IH version of the T19 to the LR transfer case before committing to that path. I may be off-base on this but Spidey-sense is tingling so I'm going to mention it.
HTH