Ok the distributor i currently have is the msd pro billet 85551 w/o vacuum advance. So would you suggest the msd pro billet 8361. Basically the same distributor with vacuum advance i have the 6al digital box. Or should i go with a standard hei msd distributor
The distributor is going to be your choice. You need to decide what you want to do and your best route. Honestly a plain jane HEI can do it all. What you have will work it is intended for racing and it sounds like that's what you will be doing. I run a pro billet and it's locked out. My engine loves 40 deg adv. Once your at the track you can play with the timing and find what's optimum for you.