Weiand #8007 intake on a 273 (Several questions)

Am I a little overwhelmed? You bet! Looks like when I get the parts located and bought I won't be able to find a convertor for the early 904! I've done some b/rb b bodys and thought the little Valiant would be a fun project but it's turning into a real pain in the *** already. But I do want to thank all of you guys for your advice/suggestions.