I was VP/GM of a marine distributorship (Palmer Power Co) and one of the brands we distributed was Borg Warner.
I built the first 19' Youngblood (maybe only) with a single BorgWarner/Arneson and a small block Chev. This was the pre-tunnel gull-wing Youngblood (originally set up with a jet drive). It ran and handled beautifully. Howard Arneson may not remember the boat, but he was quite impressed (at the time) when we discussed it.
The engine was a stock 350" LS-1, except for cam, headers, intake and carb: so was "maybe" 375 hp. The boat ran over 90 mph; with a 100 hp shot of nitrous it ran about 105. It was quite a surprise to the big block jets of the day.
After I sold the boat, a subsequent owner installed a large big block and ran the boat in Bracket racing drags. It ran the quarter in the 10's at over 120.
This was in the early 80's.
If you want photos, I'll look for them this weekend.