[Excaliber]

The comps cars ran a single 'center pivot float' style carb, mainly because that style carb could handle the cornering forces without flooding out from fuel slosh.

As to which ones, if any, actually ran high riser heads I don't know if they did, as delivered from Shelby anyway. No doubt some independants did. High Riser heads were discontinued in 1964 after NASCAR banned them from racing. Medium riser heads were there replacement. High riser heads have large tall ports and require special intake gaskets and a MATCHING intake manifold, medium riser intake will not work.