Yes, you can turbo a 6.2 but the cost really isnt worth the trouble. The injectors are different, the heads are different and the IP is set up different. Not to mention the exhaust manifold on the pass side and all the other plumbing. To do it right is more expensive than fidning a rusted out 6.5 and stealing the motor. The engines in that vintage truck were great, the bodies rusted if you even thought about salt while looking at the truck.