No spark with HEI and MSD 6A box

[DreamRyder1963]

I am having trouble with my 71 Chevy c-10 with 350 V8 with HEI and MSD 6A box. I am converting to a 6A box I followed the wiring diagrams provided by MSD and I am getting no spark. I changed to a MSD street fire HEI distributor because I found the wire was broken on the old one, I still have no spark. I disconnected the 6A box and rewired it to stock HEI specks now I have spark but the truck won't run. I think it's out of time because it tries to run but it won't keep going. Is there a way I can get it back in time without using a light, because there doesn't seem to be a timing tab on it? Is there a reason that it would not run when wired to the box according to MSD diagram?
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