Compression test is always the first thing I do when I get one. No sense in spending tuneup money on one if it needs engine work. That's the first thing I did when I got Vixen. Still had the original 170. It was skipping where it sat since 1980 when the guy dumped gas down the carburetor and hit the key. I figured burned valve. But I got it home and it had 160 PSI on all six! I hollered "HOT DAMN IT'LL RUN!" Kitty thought I had lost my mind. I adjusted the valves and did a major tuneup and she ran like a swiss watch. lol