Jason,
That should be an easy conversion. Keep in mind that the V/8 won't have much power at the low tractor RPM's, but that is manageable. The guys that have my respect are the ones who put Jimmy V/8's in John Deere A's. I've seen a couple. Turning the corner with the power is much harder to do...but it brings the RPM back where it belongs! :-(
George Willer