The 63 A body firewall was designed for a slant six only. It was modified in 64 to accommodate a 273 V8 or a six. So the 63 firewall is one year only, and a 64-66 V8 throttle bracket won't fit a 63 firewall, as there is an electrical junction right in the way.
A 67-72 A-body pedal can be lightly modified to fit (slight trim, bend, one extra bolt), with the cable running through the firewall where the slant bellcrank went. On my 63 Valiant, I cut the swing pedal off and welded on a 64-66 V8 spoon, then used a 64-66 V8 pedal. Looks original unless you get on your knees and look up under the dash, and once you put on a new firewall pad (if you do), you'd have to look close to realize it's not a 64-66 V8 throttle bracket. The 64-66 V8 pedals are getting harder to find and not so cheap these days, but the 67-72 swing pedal will work, too; it just won't look original - if that even matters to you.
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