Probably needs a nice tune up and some good plugs and wires. Mine was peppy, it could spin the 18"s from a stop. It's a damn reliable motor until it goes. I would swap out the head and call it a day. I'm in the process of a zetec swap it takes patients, i'll tell you that. An I agree with above, shes very clean for it's age reminds me of mine when I brought it home.
Do one thing every day that scares you. -Eleanor Roosevelt