Chevy 468 with ProCharger Marine M-1 & Intercooled Kit
I took this out of a TX-19 Youngblood "gullwing" we purchased. It was build
by JP Marine Inc. Lakeside, CA 92040. I'm not a 100% on the build because I never tore
it apart. The motor ran great before taking it out to install a blown Paul Pfaff Engine.
The boat ran about 90 mph with the ProCharger motor in it.  $5,200 or OBO


https://www.cpperformance.com/p-12413-procharger-marine-m-1-intercooled-kit.aspx

ProCharger Marine M-1 Intercooled Kit
Base Price: $5,599.99
# 524-1MA281-NN 

454 and 502 Magnum engines are excellent candidates for supercharging. This is due not only to
a moderate compression ratio, but also very rugged components: forged pistons, a steel crank,
and a four bolt main. With an Intercooled ProCharger system, there is no need for internal
engine modifications prior to supercharging, and power gains of 45-65% are typical with stock
motors running pump gas. Aftermarket parts are also plentiful, and for modified applications,
power gains can safely exceed 100% with operation on pump gas*. ATI has safely produced over
1,200 hp on modified Magnum and similar motors.