I just was on this long and dusty lonely road looking for a recore. Of the two shops in my town, no one had access to the reproduction cores. And only one actually was interested in looking for a supplier.
I started my research and found that Heartbeat City claims the rights to the Harrison reproduction name and makes full radiators, cores and tanks. Only they do not sell the cores or tanks direct. Only full radiators and only on demand, no inventory. I looked at the Harrison full units at HBC but I do not have a large garage full of equipment such as a media blasting cabinet. HBC only ships them raw unpainted and warns that and you must glass bead before painting.
There is also a 6 to 8 week build wait when ordering. I need one before my original looses the ghost and dumps all over the garage floor.
I looked at other reproductions but wanted the factory OEM look and installation mounts. I also have a two row radiator, and most everyone out there is 3 or 4 row. Everyone raved about Alumitech but as far as I can tell they closed their doors forever Dec 31 2012. All the other aluminum units looked nothing like factory with smooth tanks and no shroud supports.
Frustrated I shopped around and found the same Harrison reproduction units at Classic Industries, only already painted and ready to install for under 100 bucks more then HBC wanted, I had them pull it from stock and confirm it was painted. Also made sure it was not a return, all the Harrison's they offer are prepped and painted. I gave in and bought a three row since two wasn't available.
As a note I liked the price on the US Radiator reproduction which looked 60% original and I could have lived with that for 400 bucks but I found too many complaints of bad welds in terms of both quality and looks and the lack of shroud supports left me hesitant to pull the trigger.
I will have the original rebuilt if I can find a shop capable of rebuilding it as a two row and hang it on the wall as a spare.