Factory 64-65-66 pedal assembly will fit the best, but they are getting hard to find. The swing pedal you have can be made to work.
I used the swing pedal on my 63 Valiant because the 64-66 V8 pedal bracket wouldn't fit on a 63 firewall. Trimmed it a bit, and drilled (I think) one new hole. Now on mine, I cut the swing pedal off and welded a 64-66 V8 spoon and used that with a 64-66 V8 pedal. But if you can get hold of an entire 64-66 V8 pedal assembly, there would be no reason for you not to just use the early pedal assembly in its entirety. If the early setup is not obtainable, just use the swing pedal and don't cut off the pedal like I did. It wouldn't look stock, but would work just fine.
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