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"On the one that hurt an engine, what happened? "

When the timing goes to 70+ degrees because the distributor decides to self advance itself - ugly things begin to happen at the top end quickly - Like cracked main caps - then a rod bearing grabs the crank and then a self ventilation of the engine block follows

That same dizzy is sold by Jegs and Summit as a house brand also - its not an exclusive product - Some folks swear by them - others at them - I do not think Fire-Core sells them anymore - I could be wrong

Once you see how simple an MSD is to adjust and how well built it is - you will like it - I do keep an extra cap and rotor on hand as I run a 7AL3 with the MSD big coil on 16V and it is a little rough on the cap and rotor