Will a 1976 Aluminum 1 Barrel carb work on my 69 Slant 6 225

I would think so. I am running a late 2bbl on my 67. It might not be jetted perfectly, I suppose -- they were running pretty lean at that time. But I don't care for those Holleys, myself.
My error.................. I want to put on an aluminum intake, 1 banger