[Ronbo]

If your connections at the battery are bad they will heat up after a couple seconds cranking. Carefully feel around the terminals after cranking the engine. If you've got bad connections, they will heat up, a lot!! (touch, don't grab)

Your ignition system setup is somewhat complicated, if your not sure how to bypass the MSD then you'll have a hard time finding what's popped.

If it's not the MSD you'd need to swap both the coil (least likely) and the Unilite (most likely). Do you have the instructions for the Unilite? - wire the coil directly to it.

If none of this makes sense, get a friend or a pro to find it.