Ernie,
You may want to look at your WOT. It seems to be about 300rpms low. Could be a prop adjustment prob. That little bit of increase in WOT could give you better economy at the crusing speed.
I have a 32 FB 1985. I can't say enough good about it. If you're in my area (near Rehoboth Beach, DE) email me and I'll set something up tp let you see her or if not too late this year go for a ride. I have fresh 454 crusaders in mine. If I win the lottery someday she'll have diesels...but for now she's gas and we're totally happy with her.