Jerry - some truly enjoy working on these old vehicles. I still do, but less so than 50 years ago when I had less to do and did it quicker
And the factor of enjoyment alone is going to mean there is no "best for everyone" answer.
My experience over 50 + years of working on triples of solid vs progressive linkage on a 6 cylinder summerized:
Solid linkage:
(1) More homework (determining best carbs to use for the engine)
(2) More expensive (3 carbs instead of two)
(3) More difficult to tune for the novice
(4) Somewhat better driveability
(5) Smoother operation overall
(6) More uniform power curve (more power at lower RPM's)
(7) Somewhat better fuel economy
But for those who like progressive, go for it!
And Jerry, have never done the diaphragm carbs on a Honda, but we did install 4 Mikuni motorcycle carbs with the slides (like the S.U.) on a Pinto 2 liter and used solid linkage; won our class that year (and the sanctioning body promptly banned multiple carbs
).
Jon.
