bogus wrote:
how sensitive to heat are they?

I have the LTCC kit (converts LT1 optispark to LS1 style coil per plug). That brain is rather sensitive to heat. With the engine out, I am going to move the brain inside the glove box. Drill some holes in the firewall, run the harness in, RTV seal it at the firewall and be done. I hope it works and doesn't take 10 hours to fabricate!