holley 94 questions

[30tudor]

I purchased three model 2100 carbs on an Edelbrock intake at a swap meet a couple of years ago, rebuilt the carbs and have been satisfied with the performance.

These have 1 and 1/16 cast on the bowl (venturi size), have model EC cast on the other side and have throttle plates that measure 1 and a quarter inch.

I was at another swap meet earlier this year and saw another model EC carb with 1 and 1/16 on it and decided I should have it for a spare.  This one differs from the other three in that it has the FORD logo instead of the Holley 2100, it has different spray bars (large round ones) and more interesting it has a base with 1 and 3/8 throttle plates.

I guess the more I've learned about 94's, the less I know.

I'm thinking of useing it as the primary carb on my progressive set up and leaving the smaller ones on the ends.

Question is, what's the deal on the same size venturi carb with 1/8th inch larger throttle plates?  And where can I find two more of the large bases?

Anyone have experience with these?

Thanks in advance,  Kirk