At 5-11 and 220 in 2019, odds are the current "metrics" required of the MLB position at the pro level would prevent this from happening now.
I love when guys do this. Dude...you can't compare one era to another as far as athletes' size, speed etc. goes. The mid 60s and early 70s was a different world than we live in now. I've had this same kind of discussion with a friend about Babe Ruth playing in today's game.
The whole notion is silly. You can't just take a guy, put him in a time machine and bring him here. If you were to try to have a discussion about this in theory, you would have to have the player come here when he is...say...three or four years old. Then, you have him grow up eating the food we eat in the present and working out with today's knowledge in conditioning and medicine. Let's not forget how much PEDs have advanced too. That is a huge part of the equation.
Simple food like chicken and turkey have fillers and steroids in them in today's world. There is a theory out there now that suggests this is a part of the reason young men are growing bigger now more than ever...women too. Part of the reason. I think more widespread use of PEDs also contributes. Kids in high school are doing this. Anyone who doesn't think so is naive.
I know you aren't talking about the man himself and are talking about his body stats. But you put a guy like Buoniconti here and let him grow in today's world and who knows? Maybe he ends up 3 inches taller and 30 pounds heavier and faster.