Detune 388 Stroker
Here is a good article to read before you start setting up your distributor. Listen to F-BIRD'88 on setting up your distributor. Your compression ratio is 10.792 and your DCR is 7.860. If the pistons are .010" from the top of the deck at TDC + .041" compressed gasket thickness your quench is .051". If you had set the quench to .040 your static compression would have been 11.097 and the DCR would have been 8.073. Is the Comp Cams valve springs you are using Part# 981-16? If so the installed height should be 1.700", 105 lbs. seat pressure at installed height, 1.250" open height, 273 lbs. open pressure. Stock pushrod length is 7.800" and Edelbrock recommends .100 longer than stock. But it would be best to measure with an adjustable pushrod after you have it set up correctly. The engine should run without pinging if you have the correct springs, pushrods, and the timing curve is right. What brand lifters are you using with the XE268H cam and have they been sitting 8 yrs. too. BTW Edelbrock recommends Champion RC12YC spark plugs for your heads. If you have any weird ignition problems thrash the ProComp distributor.