Well, a little update from my trip today. Just got in, and not quite ready to lay down.
First, it ran like a TOP. Perfect. It actually has a bit more UMPH then it did. I noticed about 1# more of boost(about 16) and it definitely has more pull on the hills it basically never lost speed on any hill and it used to as I made this trip last July. It held 10# fuel pressure minimum, 1800 rpm, 16# boost, flat out in OD on a grade. Like typically I usually think as long as it has fuel pressure remaining, then it can't use anymore anyway?
Now, I've done three things to it this past week. I put 2 new filters on it(old, but still pretty clean inside). Next I replaced the original fuel pump with the one off my 673. It made the same 15# at idle and running down the road for the most part other then max load as I mentioned above. I also filled the tanks before I left. I had thoughts that maybe I have a draw tube issue(cracked) and if it gets down to 1/2 tank or just above it was drawing air and causing the lack of power. Since I did all three and it ran perfect I don't really know what fixed it?
The original pump was a bit weaker. I just bobtailed it up the street and it dropped to 4# under a quick jab of the throttle under load. So I think the pump was weak and I might look to get a new pump for it. Not sure if those are hens teeth or easy(and cheap)? Not sure about the draw tube in the tank? Could be an issue, I didn't run it down as low on this trip(only 240 round trip) and I only have one more race and not sure if I want to top the tanks off and have to deal with draining them to work on the drivers tank. Have to figure that out in the next couple weeks. I've wanted to replace box these tanks, but just haven't come up with anything I like(price wise).
I'm happy with the results, but wish I knew the root cause of the problem. One thing for sure, I HAVE to get that governor issue fixed. What a PITA that was, as it is getting much worse. It really holds RPM when you try to shift and even stop for a light. It sits at 1100rpm and then slowly drops to idle or sometimes I have to smack the pedal and it will drop to idle. Whatever, it has to get fixed. I hope I can find a pump shop that might just fix THAT issue and not charge me $3000 for a full rebuild?