That's a BRP-built motor, so should be very good quality. Don't know what power trim units they were using back then, but the V-4 E-TECs use the same trim system as the I-3 60/75/90 hp models, and they seem to have more problems than the triple ram units used on the V-6 models, so I'd take a close look at the trim system, i.e., corrosion on the trim motor housing and check to see how well the wires are sealed coming out of the PT relay. (It's about the size of a small match box on stbd side of motor if it's like an E-TEC.)
As for props, the 3B 13 3/4 x 15p OMC SST was a very good prop on my Seafari with the old 300 lb cross-flow 115 that probably wasn't more than about 100-105 hp at the prop. It would plane at 12 mph, burned about 8 gph @ 20 kts/23 mph/4500 rpm cruise (2.8 mpg) and run at least 32-34 mph/5500 rpm @ WOT with a very heavy load. That looper motor should be stronger and might be able to spin a little bigger prop, but I'd start with 15" pitch. I have an old Michigan 15 3/4 x 15p aluminum prop you can try. Make sure you get the motor height correct before you start screwing around with props; AV plate should be above solid water when you're up on plane like the pic below. I think I'd start out with it about 3/4" above keel. The Viper is BRP's very efficient bow-lifting speed prop and might give you the most WOT speed, but both Vezo II and Rickg couldn't get a Viper to hang on plane below about 22-23 mph! Low speed planing is real important if you run offshore very much, so depending on how much load you carry, a stern-lifting prop might be a better choice. I believe the SST II is a newer version of the prop I had, but once you get some initial test data, I'd consult Ken at PropGods, who would be more up to speed on the latest props.
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