Thanks for the informative videos on Youtube and postings on FABO. I'll be plugging the smog holes in cylinder heads as you demonstrated. I want to get the Summitracing headers: will they bolt on flat to the heads? (it's a 1975 Dart w/318, power steering). Also, it seems to have an angled oil filter adapter; the filter points to the rear. Is that ok, or do these turn to help w/header installation? I appreciate it.