Your Crestliner Commander 12 has Splashwell and side decks. That model with the splashwell was the 550, only made in 1957, and with full deck and steering up front was rated for 30 HP (yeah sounds like a lot for that small hull) I have one that’s nearly all original and run 35 HP on it. See photos below. There aren’t many of those 550s around! I look forward to seeing you on the retrocrestliner.com board!
Dave
Here’s the catalog page:
Here’s my Commander12 model 550:
