ok I figured it out FINALLY if you want to use this carb with an adapter plate you need this carb........

Why are you looking on the Holley site for Motorcraft parts. Go to Ponycarbs.

You will want a 3 stage valve from a '75 Jeep with a 304. I am also useing the stock '75 Jeep jets. Some of the Jeep sites recommend that you go 2 steps leaner, and that's with mild 258's. The fuel mixture is just fine on my basically stock 225.

Make sure the carb has "1.08" stamped on the side. A smaller number is OK, a bigger number may not be. Remember Ford used these carbs on everything from 4 bangers to the 460 and the "1.08" is the venturi size in inches. That is what I am using. The "1.21" is the next lager size and are fairly common on F-150s with the 351(w/m)/352/360 engines. For adjustments settings after a rebuild, use the AMC 290/304 settings.

Also I would suggest the electric choke. The water heated version doesn't get hot enough to open the choke fully. Well, eventually it does, but it will take a long time. Also there is really no "ported" vaccum port on this carb like the BBD's. So I run my car without the vacuum advance. The Jeep guys report better results with a Transdapt adapter over the Mr Gasket one. The bottom of the Motorcraft is not the same as a Holley 2300 so they can have vaccum leaks. I made my own adapter so I didn't have that problem.

I really like the MC2100 I have on my engine. A noticable improvement over the BBD that I was running. Works great.

A warning about Ponycarbs, they are not performance oriented. They cater to the restoration/rebuild crowd. They will literally freak if you tell them you are using a 2100 on a \6. So, some creative parts ordering is required. Notice, the '75 Jeep reference, that is your friend, just tell them it is for a '75 Jeep CJ5 with a 304, and no you don't have the triangler model tag, and everything will go smoothly.