L88's weren't supposed to come equipt with radios, so no need for shielding.

I had a similar issue with my 67 L79 Vette. The VAC was hitting the intake causing me to not get the initial timing set correctly. I would wager that the drive gear is out 180* as TWB said. This is an easy fix. After you pull the distributor take the correct punch knock the pin out align the rotor point to the indention on the gear reinstall. In my experience my car ran a lot smoother at idle. I could dial in the timing so much better. I would expect you will have the same experience and your tach cable will not be in a bind.
Good Luck

I’ve been looking for an October 1969 Q-Jet 7029215 for a bunch of years. Prices are just plain crazy on them. I’ll find one priced fair someday. Half the fun is the hunt !! Rob

Thanks for the help guys. I was able to get it in the correct position and get the cable connected the way it's supposed to be. I would have never thought of rotating the distributor gear 180 degrees, but that is what I had to do. I would have bet that it had never been off before, but after I looked at it I could see where the pin had been driven out before. There is VERY little room to adjust the timing after the shield is in place and the cable is connected.