Me, I would go NEW! If you have the cash? Add $1000+ for controls and cables Measure transom hope for the same! I don't like cutting a good transom, so I would get a new 25" lower and sell yours if need be.
Just my opion and like all people we all have one!

@7" transom height is the correct height for a 25" shafted engine. I doubt you have a 30" leg now, or if you do that sucker will be hanging WAY down below the bottom of the hull. $5K sounds like a fair deal for the SUZUKI, not a smoking deal. The age of it is the killer.

BINGO!...Bradford's ZACKLEE RIGHT...Do the long shaft on the motor and you'll never regret it.

If you haven't already, check the Zuke for corrosion around the base of the power head and top of existing mid...less likely if it's been in fresh water, but still you should look at that

On a motor that has never been started I'd be pretty surprised if he found corrosion