I haven't had much time to work on this car yet, but I changed the plugs and did a compression test. It runs and idles better, but now it seems the fuel pump is giving up. Suddenly, the motor is fuel starved when accelerating hard. That'll be the next change.
The Hurst Competition Plus shifter felt pretty sloppy. The car actually came to me with the original Muncie shifter, plus a spare one that had a part number written on it as if a salvage yard would have done. I cleaned it up in the degreaser tank yesterday and it's in great shape. Gus changed to the Hurst in '74, so my guess is that he got the spare Muncie shifter from a low miles Chevelle that had been wrecked, but decided not to use it. The mounting bracket and braces were still attached to the Muncie shifter that he took out, and that shifter was worn noticeably more than the spare one was. I was able to remove the Hurst this morning and install the Muncie. It works great, and every piece of original hardware I needed was in the Hurst box. I forgot to take a photo of the shifter after it was cleaned up, but I'll get one with it installed. The rubber shifter boot was hard and it crumbled getting the Hurst shifter out, but a new boot came with the car. I'll be installing it soon.