Sorry, the 22R was the only engine available in those trucks. Depending on your level of motivation and wallet, you can fit a V8 in there or an inline-6 out of a Supra. Your G-series transmission would probably not last very long though.
The stock axles will last with more power as long as you're not doing burnouts from gravel onto pavement. I have an '81 dually 2wd with a 350, and the diff holds up fine.
The stock axles will last with more power as long as you're not doing burnouts from gravel onto pavement. I have an '81 dually 2wd with a 350, and the diff holds up fine.