My old 23 inboard had a 17 x 17 on it stock ran good with a 350 gm. Took it to get reconed and the prop shop broke a blade off. I then ran a 16x15 to try to get the rpm's up a little, I had no cav problems. A bigger prop will be closer to the tunnel and cause cav or vent problems so be careful. The 17x17 only had a inch of clearance to the tunnel. I don't think you will be able to run a 18 dia wheel on that boat, if it will fit it's going to be noisy that close to the hull or tunnel.
Lots of the cape cod 26's and albins had cav problems when turned had to port swinging a big wheel. I think they swing a 18p 4 blade might want to ask Ron Manard his take on this.
Good luck and watch that rubble pile, it f-up a few props for me.
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