FMJ spindles > POLL
Bill Reilly did quite a bit of research on this subject. He knows a thing or two about mopar suspension.
http://www.bigblockdart.com/techpages/spindles.shtml
I have 5th Ave spindles on my 68. The difference is almost non exsistant compared to a hundred other things that could be a little off or out of whack, like keeping drum brakes on the front.