[Jeff Lee]

On ebay you can plug in what you are looking for. Otherwise, the daily "look see" will turn you into a vegtable!
Example: just search "C5AF" or "Ford 427 Holley". After looking for nearly ten years for AMC cross-ram Holley's (very rare), I figured this out. You'll get an e-mail notice once a carb is placed on e-bay. Hopefully the seller knows it's a C54A or 427 Ford part (I think most ebay sellers of Ford parts usually do) As I found out, there may be a buy-it-now and your in business. I now have two nearly complete carbs (main body, base plate & metering blocks) and one spare main body. I think I have about $1200 into all three. One pair, once restored, can go for as much as $5K so it was worth the hunt.
Have fun!