Welcome aboard! For starters I'd change the timing gear set to a new one with multiple 4 deg keyways & advance it 4 degrees and tweak the dist: set initial with vacuum gauge method/shorten slots to 38 total (no vac)/toss heavy spring/replace it with a light one/plug in vac adv & turn it CW with a 3/32" allen wrench to make it come in sooner. '73 model year was a terrible one for emission regs & you could go richer on the 2bbl jets. This'd give you a good boost without alot of down time.