Slant 6 Distributor Hold Down

I set up my 225 at TDC today with the old school pertronix converted distributor today. The marks line up perfectly on the compression stroke, and the rotor points directly to the number one position on the distributor cap. You may ask yourself, why the hell is this guy messing with his old distributor when he is going to change it out to a brand new electronic unit this weekend. Well, I just wanted a practice run I guess. So, I attached my timing light and my timing mark is facing the sky, or lets say it is at the 12 o'clock position when it should be near the 2 o'clock position closer to the timing scale. So, then suddenly I pulled my head out of my A** because I forgot about the underside distributor adjustment. Now, this distributor was installed by a reputable repair shop so I do not know what to say. But, tomorrow, I am going to connect the timing light up and try loosening the underside bolt to place the old distributor in the proper timing of 8-10 degrees BTDC. then, I will be prepared for the new distributor upgrade. And, yes I did block off my vaccuum lines.