I have a question,
I recently had a 352 out of a 67 f250 dropped into my 72 f100 and the guy who did the work used the harmonic balancer off of my 72 360. I was told that it was important to keep the original harmonic blancer on the 352 is this true? and what are the problems that could occur?
Thanks, Signed need help in Lynnwood

 

You'd do better to post this in the tech forum for that specific truck. Try this one~

https://www.ford-trucks.com/forums/forum39/

 

The biggest issue would be timing the engine with the wrong size HB. Other than that you are probably ok