To advance or Not

If it ran "good" before, it'll run "good" again.

It's a thumper, as long as the valves don't hit the pistons, ever, how much is it gonna matter!, I mean sure, it might be out, but you'll never know it,lol...... The window of install is so big you could drive a dumptruck thru it.

But if you have a low-compression engine, it will be easy to make a bad situation worse, and lose bottom end fast.