Yes. The Mallory is noted as being no longer available from the two retailers I found that had it listed. I have a Holley 12-887 on my 'list-of-stuff' for a return line if that ends up being the direction this is headed. That part would fit my real estate situation better.
All of this has got me thinking about the Holley fuel pump I use. Rated at 7psi and installation said to not require a regulator, I wonder if the latter of that is not the best choice. 7psi is a bit much for a Holley carb I think. I would prefer 4-5psi. I had a regulator installed years ago when I took this car to the track, but removed it for the current build in the car. All of this having to do with a reasonable installation in the first place, NOT an RVP problem when using winter-blended fuel on a warm Spring day.
I did order a Trick Flow style (carb mounted) throttle cable holder that is built to accept a Mopar style cable. That will get me away from the angle problems of a raised/spaced DC style 'high' bracket I have now AND away from the in-the-way style (imo) of the Mancini bracket. Foremost, it will get my 1/2" phenolic spacer in place.
I have yet to determine if replacing the carb seats helped at all. This last flood was different from every previous situation in that the fuel was NOT percolating in the bowls, it was not that hot a day, but I do know that heat-soaks do 'stack' in this car. A .001" diameter difference between the brass and the o-ring in the original pieces has to be less-than-good. I have not touched my 4779 except for idle adjustments since it was new and just back from a local builder's set-up. That's been 20 years.
Thanks to all for good points and input. I appreciate it.