Most if not all tubular control arms allow increased caster. I consider 3* the bare minimum. The high-end Euro cars that track like they're on rails use as much as 7*. Unless you're doing a lot of cornering, 0-1* of neg camber. 1/16" - 1/8" toe-in for the street. Maybe a bit (.2-.3) more caster on the RF if your roads are more crowned. 3* neg camber on the street is where front tire wear gets irregular, but I've run 1-2* neg without issues on a couple of "handling" cars.
You need to find a shop that likes older cars & knows how to do a proper setup, not just per old specs; clues will be some kind of racing experience and a no-BS conversation.
As for the wider rear tires, that didn't bother my guy on my drag car (7.10 fronts, 13X31 rears)...and that thing goes absolutely straight @ 130.