I don't think you can put 300 hp engine on the back of a Blackjack. It's only rated for a 250. You can put one on either of the Blazers you mentioned. 25 Majek.....sweet. 24 HO Haynie.....sweeter. You can put a 300 on a Haynie. Shearwaters are good boats, but in my opinion, Blackjacks are a better choice in that class.
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