It's time to do something to get my A/C working. I've had a cursory examination performed, and initial finding is that there is quite a bit of grease/dirt/gunk all over the compressor, and the tech suspects that the front seal may have gone out. He didn't recommend an R&R on the existing unit. We could vacuum test, etc, to get a better feel, but just in case a new compressor is in order, what do you recommend putting back in? The car is a '71. Should I put a replacement York in, or should I consider one of the Sanden units? I've read that the Sanden's have better performance. I understand that the Sanden's look different than the York's. Do they look out of place in an otherwise stock '71 engine compartment? I'm looking to keep the system R12. Thanks!