Problem is, v8 starts runs rough and misfires when rev it up, removed plugs ngk's, wire brushed checked gaps 0.65 leads silicone type, also removed distributor cap cleaned ect, I found that the flash shield had a piece missing out of it and badly cracked, if I follow ht lead diagram I found on Google it won't start at all, can I buy a flash shield, and where from, dd which is the starter motor for classic auto 3.9, the I took off has no part number on and looks like it's already been refurbed before, dd