Timing Retarding @ high RPM

MSD digital 6, distributor locked, timing through all rpm's stays at 34 before TDC It idles at 1500 and when I have the light on it you can slowly go to 5500 and it don't move or skip a beet. the car shifts at a little above 8000 when shifting at 7800. It does not miss at all. I believe you may have issues. I am not going to elaborate there are guys on here that know everything and should have you figured out in a jiffy. If it were me I would check mechanicals first.