I second what Steve has said. But, As far as the new engine is concerned I would take a different route. I would have an engine built up. If your are going to use the blower you would really be better off building up an engine to withstand the stress of the blower. A stock 6.5 is going to struggle with that and will have to be modified if you want to get the most miles out of it. If you're gonna do it, go all out. I would:
Get an AMG manufactured block.
Have the number 7-8 cylinders "sleaved" (this prevents cracks, which this block is known for in those cylinders). And have the block honed to the best tolerences possible.
Get 18:1 pistons.
Have the pistons, cylinder heads, valves, exhuast manifolds, and intake manifold ceramic coated. This will help displace the added temp of the super charger.
See if there is a performance cam that would compliment your super charger.
Have the injector pump you have rebuilt.
Change out the chain driven timing to gear driven timing, with the power of a super charger the chain is more likely to break. Gear driven timing will eliminate that. Really, if you are going to run a blower you need gear driven timing.
And well your at it, why not throw in some new high perf. injectors.
There is a company called
Peninsular Diesel they make some very nice 6.5's. I would call them up and see if they could help you out. There is also Diesel Depot (who's number I dont have), he is another 6.5 builder. I would stay away from him, from what I hear on the "other" site alot of people who buy from him end up needing to send the engine back, after its been installed of course. Good luck and let us know what you decide doing.