were spark plug wires the same for all slants

Went up to get some new spark plug wires for this'64 Dart that has an early 70s slant. I (incorrectly) had them pull up the info for 1964...I should have guessed at year of the engine it has, but still the listing came up as 1 bbl and we know this car is a 2 bbl. I can't see how that would affect wires... but still could anything have changed w/ spark plug wires over the life of the slant 6?