I don't have a sound clip of Walter at an idle, but that is one of the things we like best - the way he sounds at an idle. (My son can do that sort of thing - I'll see if he could put something like that together) That and Walter just made better power and would rev more freely with the Bulldog cam. We did some 1/8 mile drag racing with him and he sure felt like he made better power with the Bulldog cam. I'm not sure what you mean by the Patrick's "264" cam. It has been several years ago that I got my cam from him and all they offered were 3/4 and full race cams - I had the 3/4.
It took a little bit of fiddling to mate up the McGurk with the Fentons but mostly with the retaining hardware. I also ran heat from the headers to the manifold and that took a little messing around. The setup works well and we drive it year 'round up her in South Dakota (not much in the winter with those '50 heaters being what they are!).
It has been so many years ago that I did the conversion I can't remember if the H/W bolt pattern is 3 or 4 bolts (4 I think). It doesn't matter if you are interested in making the swap. Tom Langdon sells the adapters to fit a standard 235 or 261 manifold and they are (were) about $15 apiece. They also worked fine on my McGurk intake.

1964 Chevrolet C-20 Fleetside, Otis
1950 Chevy 1/2-Ton, Kirby
1950 Chevy 1/2-Ton Shortbed, Walter