I switched to 16v in 2004 after running my engine on a engine brake dyno and hearing and seeing the difference it made. Plus your windows will work WAY better lol. I have many many years and street miles running a 16v with no downsides I ever ran into.
Powermaster adj voltage regulator is definitely the way to go. They will make you one with the CS144 case but it is expensive. They came up with a smaller CS130 case that will work with the Champion bracket and is half the money. Part # 578028
Here it is on my motor
View attachment 392901
That being said, since I switched to an electric Meziere water pump and I am planning to do long drives with the car in Drag-n-drive events I am being told I would be better off with a 12v system since the alternator charges at 18+ volts it can be hard on electric motors like the water pump for extended periods of time. Plus if I have an electrical/alt/battery issue on the road every parts store has parts for a 12v system and no one has anything for 16v. So I may be switching back to 12v for DD events.