And just a friendly note -- While certainly extensive, Deve's article (linked in the OP's first post) contains a few inaccuracies. For example, the first 261's, like mine, do *not* have the "Captain's Bars." Their absence does not mean that it isn't a 261. Casting numbers and date codes are the best, most accurate way to ID a 261. On the technical side, Jerry probably has a few errors he can spot.
For anyone reading this who hasn't yet sourced a 261 for their AD truck .... the early 261's (from the 1954 mold) were built for the late ('54 and '55 1st) Advance Design trucks. As such, they need no modifications (like the water pump relocation plate, etc) to fit into an AD truck.
Back to the OP's original question ... I am running a 261 with an 848 head. It did ... Okay ... with a Rochester B from a 235. But I have since upgraded to a Carter YF with the correct throat and jets for a 261 and it is doing great. A plain ole 235 Rochester B will get you by (I drove mine that way for about 4 or 5 years not knowing any better ...
) while you search up a proper carb.
As stated above,
Carbking has excellent information on which carbs to look for.
Jerry's suggestions would, of course, be the platinum solution but not all of us have his machinist skills.
He might consider elaborating on that just a bit ...
