There's someone here in Huntsville with a GTiR engine set, but, it's been sitting for quite some time (~5 years or better) so, if he decides to come off it, it might be had for a steal.
PM me, and I'll get in touch with him to see what the deal is.
FWIW, anything you get that needs work, will be difficult. There isn't a machine shop in North Alabama that's worth a damn for SR work. Not balancing, honing, anything. I've not had a block bored here, but for good reason - mention "torque plate" or bring a trans bellhousing to the shop with you, and the response is "what's that for!?"
Good luck - let me know if I can be any help, either way. There's a couple of us SR ppl here that like to get dirty and keep company in garages, over cold pizza and warm beer.