I'm curious as to what engines would be the best fit to get a 35' Fountain to a top speed of upper 70s with full fuel and 5 adults onboard?

What bottom? Straight, single step, or twin step?

Sorry about that after posting I relieazed I forgot all the necessary info. it's Monday.
But anyway early 2000s lightining 2 step. Budget is 80k-90k max.

500 EFI's all day everyday....

Thanks for the info that's what I was hoping to hear. SC motors scare me a bit.

Yep, stock blue motors will get over 80 easily.

Suncoast powerboats has a 2004 with 525 in your price range should run low 90s

Thanks I'll check it ou.