63 valiant

So I went with my sister today to look at a 63 valiant with a 225 with 3 on the tree, car started and let it idle while looking it over then we went for a test drive.

After it warmed up, approaching a stop sign put it in neutral to coast and she died. Couldn't get her going right away, ended up pulling the plugs and saw some fire, perhaps a bit weak it was just to bright to really tell. Pulled the distributor cap and cleaned the points, still no go, poured a little gas down the carb and still no go. The owner said it happens sometimes, after it sitting for a while it started back up, drove it back to his house.

Shut it off, same issue. This time he sprayed some starter fluid in the carb and it started back up.

I think it's related to timing but for those familiar with these motors, looking for some input. Cars in overall great shape but advised her not to purchase till we get an idea on the stalling/no start issue.

Thanks