Maui Shtang

Welcome to the forum. That 351 is obviously not stock, sounds like it may even be stroked out to as much as 408 cu in. Not sure how readily available high octane gas is in your area or the cost but if I ws on a teenagers budget I wouldn't want to have to deal with that, heck even at my age and means I wouldn['t want to deal with that. Personally I would consider starting out smaller like say a 302. Even though stock is less than 200 HP it can easily be warmed up to 300 with fairly inexpensive upgrades that will also allow for further improvements down the road as he matures and gets used to handling the car like say a 331 or 347 stroker kit for example. Since your base is a 250 I wouldn't be surprised if it had non power steering and drum brakes still and the last thing you want is more go with out enough whoa so going too big too fast means upgrading all sorts of other stuff on the car too and needing a big budget.

to be contnued.......