***If*** she's got good and equal compression on both cylinders, you have a great motor.
My first motor was a 1966 Johnson 9.5 (identical to yours), and it was a fantastic motor. Never let me down. Ran like a champ and started within 2 pulls regardless if the temperature was 40 degrees or 95.
Take good care of that.
Do all the "usual" maintenace on that motor now:
impeller (and impeller housing gaskets)
fuel lines
fuel filter
Check lower unit gear oil for contaminants/water
check the condition of the pull-starter rope, replace if frayed at all (you will thank me...)
Also, go here for a wealth of info on that motor: https://www.leeroysramblings.com/
Good luck. You've got a nice motor.
CMOS