I've got 3 1bbl Holley carbs. One is marked 6R 894 B. The mounting holes on the base are 2 and 15/16" center to center. The other 2 carbs are marked 6R 1185 B and 6R 545 B. They have a glass side cover and are 2 and 11/16 center to center on the mounting holes. I'd like any information I can get on these carbs. Would they be a good replacement for the Rochester on my 261? What where they originally installed on? Could the 2 smaller base plates be redrilled to fit my manifold. What's a good source for rebuild kits for these carbs? Thanks