I to have a 75 with a inboard 454 that I’m restoring the same as you. It seam like you only get a few more knot cruise with the diesel. There was a rebuild on here with a Yanmar 6 built by heynow that cruises between 27 to 30 knots that’s only hear say. But heynow did sell the boat to some one and it back up for sale on facebook under classicseacraft for 45k. I also hear the Yanmar 4 cruise is about 27 knots and that motor and gear is about 40k. Also you will need to up grade your shaft to 1 3/8” or 1 1/2” That doesn’t include shaft prop and so. I also talked to bob who owns the spirt and he has a crusader captains choice 6.0 and he cruises about 24-25 knot. And two other people have the captains choice 5.7 and they say there cruise is about 22 to 23 knots.
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