The pushrods need to match the heads used, so use the '78 400 pushrods.
1967 was a transition year, '67 engines with #670 and #061 heads used the longer 9.145" '67 and later pushrods. The other '67 engines with the earlier style (different valve angle) #140, #141, #142, and #143 heads used the shorter '61 -'66 8.715" pushrods.
Let's go racing!
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[This message was edited by b-man on December 12, 2002 at 10:21 PM.]