Your smartest move would be to find out if there are any military auctions going on. The government is always selling lots of brass and other metals. Sometimes complete engines, transmissions and even old vehicles from regular, reserve or national guard goes up for sale.
As for specs, check the nearest base or some of the military books that some stores get. You should be able to find the repair manuals for almost any old military vehicle.
Check out the advertisements in Soldier of Fortune, guns mags and such.
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