Hi Eduardo and V6 fans, That little V6 gave me 30+ years without any trouble. But the spring of 2018 it just was not running the way it should. It was missing under a load so I put a meter on it and the RPMs were bouncing, so I thought it could be a bad plug wire or wires, after checking It was not ! After checking all the other systems I narrowed it down to a leaky intake manifold. And sure enough after spraying some carb cleaner around the edges of the intake the problem showed itself. So off came the intake. The surfaces were cleaned and new gaskets were installed, and since I had everything was off I went ahead and changed wires, plugs, belts, hoses, rebuilt the carb & alternator, regulator, and put a new petronix chip under the cap.. Other than the "odd fire shake" at idle that little V6 runs great. The engine parts are readily available since it's basically the 300 V8 with two cylinder chopped off. And I have plenty of room under the hood to work on it since there is no AC in the way.
In the late 90s I upgraded the suspension. I installed a rear sway bar with new boxed lower control arms and new springs that were slightly heavier than stock to handle all the stuff I carry to shows and national meets. The V6 Specials do not have a front sway bar from the factory, so I added an original 65 GS front sway bar up front to handle any roll issues, plus a set of stock height springs and new shocks in all four corners to complete the suspension upgrade. This past June I installed a quick ratio steering box and new power steering hoses to eliminate the "forever" steering. It handles more like a GS than a 6 passenger family 4dr sedan, but it's really fun to drive on long trips ....
Tony