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Have you looked at more simplier things such as your timing? Your timing may be off, which could be causing the overheating problem. I know its hard to check it in your case, so you would have to manually bring the car to top dead center and check the cam gears and piston position. Although it shouldnt really have anything to do with the idle. I would always notice my old mustang would run hotter the more I advanced the timing.
OKAY updates!!
the head checked out fine!! NO WARPAGE etc!! took the head to Eagle automotive @ Auburn.
and the bad part of the story is i've stripped a ARP head BOLT!! so i need just one! and possible 1 head stud & 1 head bolt ARP if possible...
one of their representatives told me to look into the TIMING as you said which i didn't, and to look @ the Radiator also. Since i didn't check it.. SO
WTB WFF: 1 of each head bolt & stud & Radiator Full size!! anything else i should look into? and the ??? is can the block be fawked uP not FLUSH?? needs resurfacing?
and can the block be resurfaced with pistons & rods still intach ??
Nothing is impossible that is for sure. If you have your head off then go ahead and check the deck. Also, just thought of something when you check your timing and after correcting it or if it is okay, check to make sure all of your exhaust valves have the proper adjusted. I had two exhaust valves that were not opening up all the way causing the cylinder to get to hot and car smoked a little. Simple valve adjustment fixed it and no more overheating and no more smoke. All the way to 8,200 RPMs.
As far as the radiator goes, pull the upper and lower hoses off and put a water hose in the top and check to see a good amount of water is flowing out through the lower outlet.
I know these are basic things, but best check them first before getting to far indepth with labor and $$$$$.
Let me know.
As to resurfacing your block, I dont think, at least I havent seen a machine shop, that can resurface your block while its in your car if that is what you are asking. With the engine out they could do it, but you would have to make 100% sure that there are no metal shavings inside the engine afterwards or you will be right back at square one.
I just checked my service manual and no other suggestions for overheating. I doubt it is the block itself or less a few water jackets are clogged up which would be rare as well. Im going to say Either Timing, Clogged Radiator and/or hose or water pump.
hmm okay.. right now i'm jsut stuck again.. because i stripped 1 of the ARP headstuds and bolts.. so i'm 1 headstud & bolt short.. and have no replacement..