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Scott, No one was running "Big Cars (if by that you mean full sized cars) in Grand National by the late 60s early 70s except perhaps independents. Both Junie Donlavey and the Woods experimented with wedge headed 429s in half chassis Holman Moody built 70-71 Montegos. It is possible, but not certain that HM also experimented with wedge 429s in 1971 in a 70-71 formal roof Torino driven by Bobby Allison. I seem to recall hearing that happened. You cannot view this attachment.You cannot view this attachment.You cannot view this attachment.

I believe those are the XE/SK Dominator spider intakes on the engines that Dr. John posted.

Here are a couple of shots of HM NASCAR wedge intakes. The second one has been modified to run the "box" insert of flow restrictor rings that the rules at one point required...instead of traditional plates.

Restrictor plates were introduced in the middle of the 1970 season. Unlike today, where one size plate fits all, in those days plate size varied depending upon displacement and combustion chamber configuration. Hemi big blocks got the smallest plates. Wedge headed big blocks got larger plates and smaller displacement engines got the biggest flow chokers of all. Some teams (for sure the Wood Brothers and Junie Donlavey) did try to run wedge headed 429 engines as a way to game those rules (which were ever changing BTW). Dick Brooks finished second at Talladega one year with a wedge headed 429 IIRC. That was the best finish turned in by that configuration. You cannot view this attachment.