Mr. Brown,
You can use the passanger side 6.5 exhaust manifold on the 6.2 engine. You'll have to use a short injector on #4 cylinder and bend the injector line to clear the manifold and fit the spot.
Grab the driver side manifold too. It should make getting the crossover pipe easier to fit. You know the intake manifold should be on your list.
HammerWerf
1999 k2500 Suburban Pyro, Tranny Temp, Boost, K&N Air Filter, +3.5 qt tranny pan. 190000 miles
1984 C20 249k miles DSG gear, SM-465, 3.73
1983 C30 CC dualie. 308K miles on Chassis, TH400, 4-45 A/C Looking for a TurboCharger