Propane and turbos work together just fine. You will still want a 62-1 to a S366, somewhere in there. You just spec the turbine housing a/r smaller to come in at your desired rpm. You need a slightly larger intake lobe because propane goes in as a vapor, so it displaces some air and reduces your VE by about 10%. Mitch has the right of it, though. For a rock crawler, I wouldn't really bother with the turbo.
