Bill McKee wrote:
It looks like a Holly, but would have to have to look at the 351W I took out
of the boat to tell you the make on the carb. Prestolite? You still do
not have a life?

Sure, Bill, I have a great life, now tell me, exactly what carb that
Holly, or Prestolite made had such a number as 300RS? By the way, the
number will be stamped on the carb, and sometimes also the venturi
size.
Here, take a look for yourself:

http://www.ponycarburetors.com/