Congrads for your Car.
look at ebay for a complete compound carburetion sytem from a 41-42 Buick with the small 248 engine, that will match without problems on the 263 .
You switch the carb linkage to a progressive one, the best is in rear also a front carb with acceleration pump.
Mill the Head 2mm and bring your cam to a grinder for let it make a little hotter in the midrange ( max 4000 revs limit).
build a new bigger Exhaust and thats it. :-)
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