Guess I am old school staying with the cast heads. Cost 600 dollars for head work .Last time they didn't put in the harden
valve seats and some were bad , had them all replaced and a few valves . The fuel pump is just to fool the inspection people if they ever check.
I got the wrong pump so I just silver brazed the port and capped it off and hooked up the line to it. Never been able to find the correct pump ,no longer made for the 455. Don't think with the factory intake and exhaust alum. heads will do much for me .
I know someone that ran them on their boat with no speed improvement.