[Lukn4trbl355]

the compression was usually between 8:1-9:1 usually if its pinging it needs more octane or the timing needs 2 be retarded. The engine prolly had to much timing and caused you to blow the rings since u lost all compression in #3 The ignition timing should be 8 degrees with advanced not hooked up you can try advancing the timing by 1-2 degrees and see if it runs better n go from there. and if engine has a stock cam idle should be in the 750-850rpm range.