bravo3 lower to imco -2 shorty
 

Am changing my bravo 3 lower unit to a bravo 1 -2 imco shorty.I had 1.81 ratio with the 3. Ratio now is 1.5. Center of prop to bottom of boat was 8 ". 98 mariaha z-222,was running 56 to 58 @5000with 454 mag mpi at 3300 ft.Also am adding a procharger ,7psi,and lightning headers. Any ideas on what to expect?,and what prop to start with? thanks

nobody has any ideas?

I would try a 28P B1

Thanks, 3 or 4 blade?

a B1 is a 4 blade.