Terd,
Lots of choices there!
The McGurk intake was dyno tested on a 216 in May 1953 Hot Rod, I think that article is on the web somewhere. More dyno tests shortly thereafter on the 261 w/McGurk, don't have the reference handy right now.
Biggest choice on the carbs might be what size (CFM) they are.
As I look thru my data, any of the three (Rochester "B", Carter YF, Holley 1904) could be anywhere from 160cfm to 240cfm at 3.0" Hg. With a 261, I'd lean toward the bigger pair if they are different. If there are numbers on the carbs I might have some info or others might.
If you plan to race, most strips will not like the glass bowls, they don't like glass anything especially with fuel in it. But they look cool.
Would you be able to measure the port diameters on each intake?
(Offy and McGurk)????
