Vance, I replaced the Rockchester carb several years ago for a 650 Holly double pumper with the proper floats new from a racing boat dealer in Florida. Paid $550 for that dude. I had it re-jetted from what he had in it. I went to much smaller jets and think I could go down a bit more since I see what I think is too much black carbon on the tail pipe. I love this old truck and really haven't been giving it the attention it needs since I bought the LRD2. I had an electrical problem with it for four years that no one could seem to fix.
I rewired almost everything under the hood trying to fix the problem over the years and I guess I must have done something right about 6 months ago and it's running fine now. There is still a drain on the battery somewhere I haven't found and neither has anyone else that knows more than I do about electronics. I bought it because it didn't have any sort of computer but it has bumfuzzled me for almost 15 years since I bought it. If I drive it everyday no problems but I keep a solar battery charger on it when I'm not driving it or the battery will be dead in a week. The thing that has always bothered me about the truck is that no one has altered any wiring on the truck at all until I started doing it in the process of trying to find the one problem.
This is what it would do. I'd go start the truck at whatever time of day it was. It started fine, and quickly, once I set the choke, no excess cranking. I'd drive to town, go in a store for 10 minutes, come out to start the truck and it would not turn over fast enough to start the engine. It sounded like a almost dead battery. I would bum a jump start and it fired right up. Had the battery checked and it was okay. Even after putting on all new cables, new ignitions switch, new relay switch, new battery, new starter (twice) , new fuse-able links where it had them previously, new alternator, and a few more devises under the hood and on the steering column., it would do the same thing. Finally I had a half ass mechanic have a look at something on the transmission selector under the car I suspected might have something to do with the ignition switch on the column, he made an adjustment on that linkage and the problem went away as far as it not starting after being driven. That one problem has been hounding me on that truck since 2008 and is the reason I have only driven it 10,000 miles in 15 years. I couldn't trust it to go to far from home, although I did manage two trips to El Paso (156 miles each way) on two occasions over the years. Both times something went wrong with an electrical part. I'm starting to trust it now and only want a tranny tune up before I dare take it out in the boondocks alone.
