1975 defiant

So, as some of you may know, I’ve been in the market to replace my jotul firelight 12. I just bought a 1975 Vermont castings defiant for 50$. Seems to be in good shape. Wondering if there are and quirks or problematic things I should be looking for before I let this thing thing burn all winter. No cracks internally and it seems to be in good shape over all.