I am in the process of a carb swap from the Carter to a MC2100, after installing the MC2100 it fired right up and the weather was in the low 30's outside, way better than what the Carter would do. At first I had a vacuum leak and couldn't get the idle down. I corrected the plate/carb stack-up with fresh homemade gaskets, now it would idle down to about 800 or so but idling rough. I found a leak in the choke diaphragm set-up which I then plugged, it was idling better but not great. I have an HEI ignition set-up and have yet to throw a timing light on it. I will update the post with that info once I adjust the float height and replace the Power valve. It needs some tweaking before its trail or road ready, a few questions for the experts...
1. During the tuning process I had a backfire through the carb and blew out my power valve, a 8.5 hg was included with my rebuild kit, should I replace that one or go slightly lower? I know there is a calculation I've run across out there but I have yet to hook a vacuum gage to it while it's running. I installed a spectra power valve saver to prevent this in the future.
2. What do you guys suggest for the float height from the top of the flange? Right now i have it set "dry" to about 1/4".
3. For the short while I had it running it seems to be really rich, my current jets are 49s I plan to pick-up some 46s or 47s, does that sound about right?
4. I have a manual choke kit for it that I plan to swap in, is there a hole under the base plate of the carb I need to plug? Is it also safe to remove the choke pull down diaphragm if I am going with a manual set-up?
5. I checked my fuel pressure going into the carb, the stock pump has it about 7psi. Is this too much? I've read the MC2100s like 4-5psi, should a regulator be installed to lower the pressure?