I run one heat range colder than stock. Well go to the parts counter and tell the 17 year old dip
you want a set of plugs for a 70 LTD with a 460
auto trans,A/C,P/S and yes it is green. Then make
him go to the back of the book and cross it to the next lower heat range. Gap at 35, I just can not think of the numder off the top of my head
sorry.