Blowers can be had on the cheap by buying on c-list or the bay the only big requirement is making an adaptor plate blower to lower intake manifold so the snout aligns with your serpentine belt. A diesel is much easier to do than a gasser.
The Eaton M112 is a good starting point running 8/10 lbs boost a 6-71 can be used too however it's big moves massive amounts of air so you have to limit boost on the 6.5 to say 4/6 lbs. Deep pockets then plan on $6/7k for new direct fit kit then the cost of exhaust mods.
Best part is all the injectors are easy to get at, you can install a very BIG air-box, run single or dual exhaust, airflow around the diesel would be much better.