In your shoes I'd use up some of those three fudge points between 97 and 100 to pick a better carburetor than a Holley 1920. My top pick would be the '63-only Stromberg (Bendix) WA3, that's
this one (the linked carb needs a replacement for the missing welch plug—not a big deal). Second preference would be a carefully-chosen Carter BBS.
