Pete

The 998-1 shows to be original equipment on a '55 Thunderbird with the 292 engine and the full P/N was ECJ-9510-D.  The 1074 shows to be off of a '55 Ford & Merc with the 292 with the P/N for this one, providing there wasn't a suffix after the list number, being ECK-9510-H.  Unfortunately the book showing these list numbers isn't detailed on the specific carburetor differences.  The differences are likely minor and could be more related to either slight timing advance differences or could be as simple as an automatic transmission calibrated carb versus one for a standard shift transmission.

If you'll look at the main body cover (top), there should be a stamped number such as 25, ,28, 30, 30A, 33, 33A, etc.  These numbers are typically pretty small and sometimes difficult to read or makeout.  Based on these numbers, I may be able to nail down some production dates and possibly if it was a standard or automatic transmission equipped carb.

       I went over the carb and found the following numbers ;

"521" on top of the accelerator pump housing

"S3"  on the main body by one of the secondary venturis

"12R1253B" by one of the primary venturis

In your reply you refer to a 292 in 55 Fords.  Did any of the full size cars come out with 292's?  I always thought only T-Birds and Merc's used 292's in 55.

>Gary

As Gary mentioned, the 292's were a special order for the full size '55 Ford cars.  Orders typically had to go through law enforcement or government agencies.  I did have a '55 2 door Mainline that was a P code and had the 2" dual exhaust along with some novelty factory options but it was originally a state government vehicle when new.  When cleaning up the doors, evidence of the old state agency door badges were there.  I do still have the frame for that car sitting here but the body went to Florida to be used as a pattern for a '55 Ford fiberglass body mold.  As there wasn't a stitch of chrome trim on the body, it was quite desirable for that.

Looking at some of the teapots I have sitting here, the number in question can be found on on the passenger side front corner of the fuel bowl cover (top).  These numbers can be very lightly stamped which makes them difficult to see without some thorough cleaning.  Here's a couple of pics.