It looks very similar to a 60's Rayson Craft "J-hull". They both have that "not pointy" keel line that drops abruptly down from the bow tip and rolls under.
Very little to nothing is common with a 440RB when you're talking a "early" Hemi. There were more than 20 different displacements offered total by the Dodge/Desoto/Chrylser brands. The 331/354/392 were Chrysler brand (Imperial, Windsor, New Yorker and whatever) specific and used primarily in all the legendary race applications. There's actually more in common with the Mopar smallblock (318 Poly, 273/318/340/360 LA) than big block. some of those early Hemi's had extended crankshaft flanges and the area at the bellhousing for Marine/Industrial applications.
Personally, with my budget, I'd buy it and do a cool 60's retro thing with it using whatever brand motor you want. Nicson/Edelbrock marine hardware is on Ebay all the time. You won't be the fastest but you'll be your own sort of cool.