The bore on the winters manifolds used on the GS cars was set up for 58mm webers, not small at all. They are huge, almost siamesed LOL
That's it. DCOE pattern is DCOE pattern, the bore centers are the same distance apart regardless of the bore size.
The winters setups are out there, a month or 2 ago there was 1 on ebay set up for lucas injection (used throttle bodies), it went for over 4.5K$
Sure, the katicore one has a revised thermsotat housing but for the rest, it's pretty much a copy. just like the offy crossram and edelbrock str-10s are copies of the gm/winters 2x4bbl crossram (z28)
Here's the katicore manifold
and here's the winters manifold that was on ebay a while ago:
What's a DC&O? Std a DCOE carb has either 40 or 45mm bores and the chokes thast go into it determine the real size.
The manifold may not look the same but it really is very similar with the carb/tb angles and all, the new one just isn't set up for the huge carbs and the pattern for that, instead it's a normal dcoe pattern.
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