mercruiser 165 prop?

[73Marauder]

I have a 73 24.5 foot autocoast marauder with twin 165 mercruisers. at some time in the past someone put a pair of larger 4 blade props on that wont allow me to install the zincs.
Any thoughts what prop might be appropriate for my set up?

 

[steelespike]

Most setups you can get compact or flat zincs.
You can't just change props you need to select props that allow the motors to operate within their rated rpm.
Very likely the prop size is under the prop nuts.
Before changing the props we need your present prop size, lightly loaded wide open throttle rpm and gps speed.