oh I don't know that it is not worth it.
On an old engine, you will get lots of crud built up ontop of the valves and pistons. Really. Just look at some old parts sometime.
The MCCC works well, just do it like it says in the VFAQ and search around for more info.
Also take a spray bottle of water and spray it in the throttle body once it has warmed up after you have done the treatment. It will loosen up lots more crud that the chemicals have softened. It will all go out your tailpipe.
This will help quite noisy valves, reduce knock(hotspots on the piston, glowing carbon) and allow more freeflowing air thru the system.
Just follow the directions.
change your oil after and at least clean/gap your plugs too.
11.93/117mph, bad driver, old fuel