Bigger question is what would his English name be?
He would almost certainly have more tests, more runs and more centuries. The only real question is average - and that depends on whether you think he would have been allowed to debut as a teen and retire as late as he did in his poor run of form. Even with that scenario, and accounting for a high percentage of games vs Windies, SA and Aus, don’t see him going below 50. Given the extra runs and centuries, may even have been held in higher regard with 18,000-20,000 runs at 52 or so.
If somehow he would have averaged higher (with a more mature debut and earlier timed retirement), you’re still looking at around 15,000-18,000 runs IMO at something like 56-60