That is interesting to know about the timing cover... when I initially put my first parts order together, Butler was helping me put together a list of what I would need - and it looks like they hooked me up with a '69 style timing cover (APE-N538).
I am not going to be too fussy about exact year-correct parts on this engine build so I am ok with the '69 style timing cover.. but does this mean I should be looking for bracket set from a '69? I assume this will have no effect on which pulleys I need to find?