I just installed a set of Doug's D452s on my 70 Charger with a 440(493) and Eddy heads. No problem with plug clearnace with the angled plugs. The headers fit very well and I only had to clearnace the one pipe slightly on the driver's side at the torsion bar. Probably because I have the larger than stock bars installed. I think these are the best fitting header I have ever installed. Here's a shot of the driver's side top. Sorry, don't have any others presently that show them off any better.