I was going to say... $1000+ for X heads is ****ing stupid, no offense to you lol. I got a set of Edel RPMs in great shape for $700 shipped from the Corral. I have them paired with a XE270HR-112 cam(used from the Corral for $175) and a Tmoss ported Cobra intake(not sure what he's charging now but its not more than $250 for a full blown portjob). Anyway there are deals to be had out there as you can see. I paid about $1400 combined for my HCI and I'd say about another $400-$500 for things like pushrods, water pump, timing chain etc...
An HCI isn't cheap but you don't have to pay $2500+ for a TFS kit or something. Just make sure that the heads you buy will clear stock pistons if that's what you're using. Also get a set of heads with stud mounted rockers. SO much easier then pedestal mounts.
As for what else you need:
-Adjustable pushrod checker to measure for proper pushrod length
-Solid checking lifter for pushrod measuring(an old lifter converted to a checking lifter works well)
-Digital caliper to measure the pushrod if it isn't marked
-Hardened 1 piece pushrods
-Timing chain
-ARP head bolts or Studs
-Gaskets
-Degree wheel to degree your cam
-Rockers
-Possibly some Joe Heck SN95 valve covers if your stock ones won't clear aftermarket rockers on aftermarket heads
-New plugs and wires are a good idea
-Moly lube, Black RTV, assembly lube
Probably a few other things I'm forgetting.