1973 valiant 318 car stalls when compressor comes on

Thank you , the timing marks are way off but it is the only way I can get her to run smooth way advanced can't see the marks way above I did shut her down pulled number 1plug got her on top dead center on zero pulled the cap off it's on number 1wire with rotor pointing to it looks like some freeplay when I turn the balancer back and forth has some play or the balancer slipped but I drove her and no pinging starts right up and not running hot and so much more power got her at 870 rpm s at idle a little high but when i.put her in gear the ac does not stumble and it's not banging in gear it has a egr valve but it's not connected maybe it's stuck I better check it out