Camshaft Blues

I have a MSD 6al, Billet distributer, 750 edelbrock performer carb, headers, KB 10:1 pistons, Edelbrock performer RPM intake, and the edelbrock performer RPM cam. Will be installing adjustable roller rockers towards the end of the summer. When i installed the cam i didnt degree it in. I just lined it up with the mark on the Crank shaft. Was that a huge mistake? i meen i ran pretty good when was using the old mopar electronic ignition, just havent figured out the timing with the MSD setup and want to get your guys opinion if there is a flaw in my setup.