Well it doesn't look like anybody is showing you any love. I am possibly going to run a set of SC 5205 or 5215 (which ever ones are 1&7/8) on a '65 dart 451 & need to mod 2 tubes on the pass side but no biggie as Speedway mtrs is a mile away (tubing) and a coworker is a skilled welder. www.bigblockdart.com may (very likely) have info 4 you. I vaguely remem a pic of them in a later big block A w power B & all was good in the 'hood.