Perhaps too small for maximum performance, but some math:
2 X 32mm with 26mm venturi = 1.646 in.2
2 X 36mm with 27mm venturi = 1.775 in.2
There are other 5200/DGV venturi sizes, less common, 23/27 and 23/29.
Total venturi area for both Webers = 3.421 in.2, about 386 CFM (rated as a 4 bbl. @ 1.5 Hg").
This is much larger than any 1 bbl. (requires 2.08" venturi), so a big step up from the OEM in all cases.
It's about the same venturi area as a big 2 bbl. with 1.48" venturis, or a small 4 bbl. with 1.04" venturis.
IMHO the adapter and small manifold size was the restriction.
292" X 5,000 RPM @ 90% VE needs about 418 CFM (rated @ 1.5 Hg" for a 4 bbl.) or 591 CFM (rated @ 3 Hg" for a 1 or 2 bbl.).
