For an Ironhead, Ebay is a good place to get reasonable prices for parts. I never had an Ironhead, so I can't recommend cams. You should do a lot of reading to get compatible parts. Nothing worse than parts that don't work together.
Won`t suggest a particular manufacturer.
But for bar hopping\stop light to stop light you will want something that comes in just off of idle and makes power through to the midrange.
Something with fast ramps will give you a very crisp throttle sound and response.
Your lift and timing, set my the lobe spread which is what creates the lope, will depend if you want the cams to be bolt on or if you plan other engine work.
If you are staying reasonably stock then an OEM carb properly jetted should be plenty.
Yes, Bill's.Bill's Custom Cycles is a good place to find those old obsolete hard to find Sportster parts.