Ford 390 timing
I have a stock 67 Cougar GT with 390. It has points. It is low miles and not rebuilt. It was a California smog package engine but the smog pump and attachments have been removed. The timing settings are listed at 6 BTDC for the smog engine and 12 for non-smog. I had set the timing at 12 and it pings really bad at WOT. I am running prem fuel. Setting it at 6 BTDC seems a little low and I have to really adjust the idle screw up to keep it running at idle. Is there some other mechanical aspect of this "smog" engine that I need to set it at 6 BTDC and will I be doing any damage by running above 6.