Ok, today I had a mechanic look at motorhome. Yes, I have an 89 454cid, BUT no throttle body like I was told by PO. I had pulled air cleaner off earlier this week, and looked, thought to myself 'self, that sure looks like a 4 barrell, not a TBI'. Sure enough, I've got enough grease under fingernails that I was correct.
So, no problems in locating electric fuel pump closer to engine, the one that runs off of crank is bad, LEAKING very bad. It's a wonder I haven't blown this thing up by now.
New fuel pump this weekend. Will replace sending unit later, can live with a 'bouncy' fuel gauge until have a week off from work to do the tank drop. At that point, will clean out tank and put in a sealer at same time.