You may have covered this, but I purchased a matched pair of 660 center squirts in the early '80's for a Weiand 440 2x4 tunnel ram I was fabricating for use on my 409CI Chevy.
The guy who sold them to me pointed out the the carbs used a bigger 750? base and the base was matched to the carb using a taper boring bit to give the smooth transition. They were professionally done and I got them for a song back then.
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