After much deliberation, listening to the kind words from friends, fellow 86 owners and other general car enthusiasts, coupled with an extremely generous offer from Carson Performance - I finally picked up a 3rd 1UZ engine today from a reliable source in an attempt to finally get this thing on the road once and for all.
I'd like to thank everyone again that's helped me over the past few weeks. Your enthusiasm and motivation to want an end result to this nightmare for me has spurred me on and I don't think I would've made this positive step without your input.
Tom at Fensport has been an absolute trooper despite the car wanting to kill him twice now, I can't thank him enough for his endless patience and advice over the past couple of months. I'll be collecting the car from there in the next week or so and arranging a weekend with Simon at Carson Performance to do the switch.