HELP!! 1966 230s engine swap.....vibration???

[sprbxr]

Due to the severe engine damage caused by a broken valve, I must install a new/used engine. I have been told by several sources that I must replace my manual trans engine with another manual trans engine. If I don't do this I will be rewarded with a bad vibration from the drivtrain. What engines will bolt to my original manual trans? 220s, 230s, 250s, 280s? Are the flywheels from the previously mentioned engines interchangable? To eliminate the possible vibration, what components must be changed. Thanks for you assistance in this matter.