You are such an asshole sometimes. GM sells these as crate engines for the automotive market, just like they do the Ramjet 350. I'm addressing the one issue that I know these 502 engines have, which is the oil rings, and the new ECU makes it that much better as far as programmability. Now it's not much different than an LS-1 in terms of technology imo. At least I have something a little more modern than that wimpy old 350 HP (maybe) 92 LT1 with the "hopeitsparks" ignition you might put in your 55.... someday...if you ever work on it. LMAO!
Oh, and by the way, I never replaced "the crappy marine ECU" because I never had one.