I'm currently building a Goldberg Tiger 60. As I have been in this hobby for 40 years, i have a box of old engines. As I'm too frugal to buy a new engine, I have an old OS 91 FS Surpass engine that I'm planning to use for this build . It has good compression but I recall it just didn't have the poop that a new engine has. I'm looking for recommendations for what I need to do to get this engine back to it's original performance.
I'm 81 years old and this is going to be my last kit build.
Any suggestions would be greatly appreciated.