i built up one of these little guys for my boat bigger cam valves ported head and higher comp it works darn good
i am limited to my carb size as it has a mercruiser manifold exhaust syst.
check clifford performance for some parts and i think i got my cam from crane but not shure as i had a shop put the thing together.
mine shure runs strong in a 17.5 ft older deep v boat i get about 45 mph , impressive for just a 4