#1. Re-tap the threads in the front hole on the intake. Edelbrock NEVER taps them deep enough. Tighten the long bolt that pulls the manifold and timing cover together FIRST, then do the rest of the bolts. (Install all the other bolts, and tighten them finger tight.)
#1-1/2 Consider cutting the water crossover off the manifold to give it more room to move. I can explain if you need more details.
#3: There is an intermediate wiring harness that runs under the left side rocker cover trim. It's encased in a sleeve that you'll see after you pull up the carpet. If your floors are rotted out, there is a possibility that this intermediate harness is corroded. The 12V check that Jeff recommmends will be a useful tool in determining if this is a place you should look. I had similar wiring issues to yours. Replaceing EVERY harness in the car was the only solution.
