Finally in the last stages of planning of re power of my 35 commander salon (1972). 

Plan is now two small block 350 carb engines.

Will also change transmissions and the fuel tanks while the engines are out.

What transmissions do I buy for the 350 chevy marine engines?

Will my stock shafts be fine or do I need new shafts?   My boat came with the Ford 427ci engines so im not sure if that makes a difference in shaft size.

Plan is to take the tanks out once the engines come out then have someone make me some new ones or if I could buy new ones before hand so I can just take the old ones out and swap in the new ones that would be best.  

Any advice is greatly appreciated

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With newer ZF transmissions, both engines turn standard rotation. Both transmissions are identical. The props still turn opposite each other. This is done by one transmission running in forward and the other running in reverse basically. They're geared identical in both directions and can handle the same amount of power in both directions. This is not true of older transmissions like Paragons or Velvetdrives.  

Heimlich2010 said:

Ok so standard rotation port and starboard engines as well as standard rotation port and starboard transmissions. Got it.

So both props turn the same direction?

What was the reason for the original counter rotations and are the downsides to standard standard setup we are talking about about

Sorry if I'm missing it here

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