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Did you BUY that hot mess? What does the rest of the bike look like?
OUCH!!!
I just went through this with a 76 Convert. It ran but an accident fried the voltage regulator. In replacing the regulator, I changed where it was mounted. During the process, I did a lot of sorting and routing cables and wires. Then when I tried to start it, it would pop, spit and sometimes backfire blowing off a carb. Not wanting to mess with the Dyna (figuring it was the problem) I ditched it and installed points. Same problem. Boy did I get frustrated on that one! Eventually days later, I discovered the coils had gotten their leads swapped, at which point it started and ran. In your case, it's easy enough to check that it's timed correctly or at least close. Since you're getting a spark, all it needs is enough at the right time. No charging system or anything else is needed for it to run. Starter and power to the Dyna and coils is all that's needed. You might try starting fluid to get it started. In the old days I'd squirt some oil into the cylinders of the old cars I got because rings need a thin film for compression. After sitting a long time the oil would be all drained back into the sump. qOne thing about the Dyna - they're finnicky about grounds. If the back side of the Dyna distributor plate isn't shiny it can cause problems. If it's dull, shine it up.