i pulled the orig 454 from a 79 Pantera. the hole the water pump attaches to was bigger than original and block was much thinner than others i had to compare to. mine was Hudson river 30 miles above new york. brackish water for 20 years and sitting for 15. any 40 year old raw water marine engine is too corroded internally to ever trust. where did this boat spend it's life?

running and paid for, continue to use it, but i would not add 100 hp and similar increase in cyl pressure.

fresh water inland lakes its whole life

you Should leave it stock i would say you can’t handle the extra horsepower

We have been infiltrated by vegan blow boaters again.......

The biggest problem with forced induction is that it makes a lot of power. If your current setup (engine/drive) is not built for the extra power you're going to start breaking things on a regular basis. Then instead of enjoying a day on the lake you're constantly chasing your tail on what did I break now. I'd keep your current boat as is and if you want something supercharged do your homework and buy a boat that someone else spent a ton of money and headaches dialing in. That's the best way to do it IMHO.

but OP has a 22 Donzi. not easy to find. fast. holds it's value as well as anything. OP. I would start with the transom and a bravo setup. probably gain 5 to 10 mph with the same engine. then hydraulic steering.