430 mel exhaust manifolds

i recently purchased a 1957 Campbell Day cruiser boat that has a 430 MEL in it. I discovered very shortly that the marine exhaust manifolds are cracked. I'm having trouble locating any replacements for it. Does anyone know if you can use manifolds off any other blocks........427.....? that might be easier to locate.

MEL's are there own deal
Frank

Did search for the MEL and a NASCAR history page loaded.  At the bottom was a link to Chris Craft boats.  Apparently CC used the MEL well into the 70s.   There should be stuff out there for them.

Might be easier to weld them up than find replacements. I just scrapped an entire car with an MEL motor about three weeks ago buts it's already long gone.