I use to have a dualquad lowrise with 273 intake bolt pattern. It was an aftermarket aluminum offenhauser. Only factory dual quad was produced on the poly motors not on la small block.
Hey dart4fortey where did you get that? I got mine from Mopar John's wrecking yard before he passed then traded it to a kid with a 70s Mopar that worked in puyallup.
hate to tell you I bought a complete 273 dual four setup with 2 new Edelbrock carbs, air cleaner and linkage on ebay cheap, not that long ago. Kept carbs and sold the rest, cheap. sorry