I had a '82 245 once; it was a super car. However, somewhere over 200,000, I decided it was time to trade. I still miss that car, but putting thousands of bucks into a car that age really makes no economic sense. Unless it is pristine down to the wheelwells, or you are seriously emotionally attached to it, it makes better sense to start looking around for a replacement. For the cost of engine replacement , you can get a better car(unless you can do it yourself and can find a good used motor). After all, a twenty year old machine will have lots of hoses, fittings, circuits, etc. that may start breaking down, even if you get a shiney new engine.