I have a 78 with a 200 Johnson on it. 43 seems a little slow. You might want to weigh your boat and compare it to the original specs. (allow for any gas in the tank) Waterlogged foam can add a considerable amount of weight and slow your boat accordingly.
As to the props, what TheFermanator said is good advice. Just remember if switching to a SS prop that SS flexes less than Alum, so normally you move down a pitch or two when switching. (So a 17P Alum becomes a 16P SS).
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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