[swamp rat]

I think before i replaced an intake i'd do the distributor first, you say its bad so make sure its fixed or replaced before moving on to other things. then a new set of plugs and run it for a bit and check the plugs again.

You say you have a mix of rich/lean results on the plugs, without pictures of each plug and what cyl its from its hard to determine what your issues could be, is it oil fouled, or too rich, it could just be that now need some valve guide seals, or maybe a good carb rebuild and adjust.

For general driving your stock intake should be just fine.