We had a 1983 Buick that was the same thing with the 307. Those things are tanks to say the least and are comfortable as all get out. I remember taking vacations and laying down in the back seat and falling asleep so many times as it was so comfortable. Any ?s lemme know as I know those vehicles inside and out. One thing I can tell you is the 200R4 ***** is very finicky. So switch out that ***** fluid ASAP and new filter as well. Also those things are not meant to go faster then 75,lol. A good tune up, ***** filter/fluid, radiator flush and a few other things you will want to do it as soon as you can. ***** was the weak spot as the 200R4 from factory sucked but if you ever rebuild it upgrade the internals across the board and no shift kit.