I hear you. We had a pair of Chrysler 383s in a Trojan 36' woodie. At around 1400 -1600 RPM they were surprisingly thrifty. A friend had the 440(?)s in a T44, worked well for him. Plus, thanks to MOPAR auto rebuilders, all engine parts are readily available today with marinization stuff available from Crusader.
MY SIL rebuilds old MOPAR engines, most are now using fuel injection and ditching carbs. Enjoy.