@jamesinc - a couple of questions, if I may -
In your '77 with a modern compressor and condenser, did you modify it to use an CCOT system or did you recalibrate the TXV to use R134a? Did you change the evaporator to the R134a retrofit type?
My plan is to add aircon to my 142 and 145 projects, neither of which have it fitted at present, and I'd prefer to fit them with a CCOT system. I also want to sort out the A/C system in my 144, which had a Sanden compressor fitted, but also appears to have an R12 type evaporator with a TXV. Then, while I'm at it, I want to get the air conditioning system sorted in the 242GT before I drop in the B230 with LH 2.4.
I'm thinking that CNO-38186 parallel flow condenser (originally to to fit a VN-VP Commodore) sized at 625mm x 360mm x 16mm might be a better proposition that the 240-type 650mm x 385mm x 50mm tube & fin CNO-96020 unit.