My 67 has the stock heat/ac unit under the dash. When I pulled the motor I broke the heater core so I need to replace it. The po took out the ac stuff and covered the holes coming through the firewall cover with foam crap. I would like to run ac on the car and have heat. I need to hook everything up including wiring and vaccume lines etc. What are my options. I have a 351c and dont want to run a big original compressor. And I dont want to drop a lot of money into a all new system if I can make this work.