I worked in a Corvette shop for a few years. Back then we changed many Optisparks. Not fun. The cause was usually failure to replace a leaking water pump, or the owner pressure washing the engine. There were some tricks to making them more reliable but most of the support is probably long gone now.
I almost converted an LT1 intake to distributor. I needed a manifold for a set of Vortec heads before there were many aftermarket options. Luckily I found a marine intake.
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