Re Propping 83 Merc on 72 Seafari

[McGillicuddy]

Greetings all. Wealth of knowledge here. Hopin to gain some so I can share it down the road. I'm newly registered and the proud new owner of a '72 Seafari. This baby came with an 83 Merc 115 in pretty good shape. I've rejetted carbs have adjusted timing to hopefully better burn, cool and cope with modern ethanol. Prop appears original but I'm guessing there are better modern prop sizes, shapes, etc., to maximize fuel efficiency and overall performance. My offshore M.O. is to cruise in search of working birds, temp breaks, and kelp paddies, then drift or troll depending on what's happening. Could any of you esteemed seafarers shed a little light on the right prop. I know it's not exactly a gas miser but I'd like to run this motor for at least a few years while saving to repower this old girl so re-propping for fuel efficiency is my primay goal. Thank in advance for your opinions. -- McGillicuddy