That is an HEI dist. There is nothing wrong with them. Upgrade it to what? The same thing just made by somebody else. Had them in vehicles for 100,000 'S of miles only once have had a failure. I would run it just like it is. wouldn't change a think. Maybe the advance springs or weights, and shim the play in the shaft but that is it.


Tommy
59 apache 1/2t
261 short stepside