Replacing the plugs are fairly easy but #8 can be a challenge.What works for me,a telescoping magnet,2 inch 3/8 extension and a 3/8 ratchet with a pivoting head.On the difficult plugs I drop the plug socket in the plug hole then the 2 inch extension loosen the plug.Fish everything out with the magnet.Im sure everybody has a different methed but this works for me.Other than the smoke Id have to say its a coil-injector problem.Id start the car and start pulling plug wires and listen for a no miss.If you work on your own car this LT5 is no different.Would like to see some pictures of that G.T.O. When I was a kid my Mom had a 67 4-speed.Wish I had it now.
