Mach prop can work pretty well. The Mach lock hub saves Bravo's (I was an early racer of Bravo's) Call Billy at Don's Marine salvage he had some Mach's there. I am pretty sure I have a set of 29's still.
Steve

Smiklos can you PM me the contact info for them? I would appreciate it a lot! Cant sell my Bravos till I get ahold of another Mach! :)

As far as "Swapping the Props" That would involve swapping the lower units right?

for testing purposes you would just use reverse for forward and vice versa, if you like the way it handles then you just change the way the cables are connected to the shifters to switch the operation. Bravo drives can run in either direction with no problems maybe somebody with outboard knowledge can chime in if the same is true for your outboards.