Alan, I'v e never done an AC car and I think I have a spare AC set up out of a parts car. Can you show me what you need and I'll see if I have it?
If the parts car is a 70 it will have at least two lines Alan could use, if it's a Big Block 70 it will have all four lines he needs...
The suction line for a big block (from the firewall to the back of the compressor) has a dip to clear the aircleaner.... See attached..