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Just installed Doug's 452's in my 1969RR with 512. No issue with torsion bar on driver side (3/8 clear). Passenger side has no issues, but was a pain to install. Driver side was quick and easy. Angled Plugs fit good with my aftermarket heads.
your best bet is the TTI's or Hooker super comps. Others will fit but may give problems when it comes time to get to the plugs. What heads are you using?That will also make a difference.