would you put this on your 440

Bill, I am not familiar with that part. Here's what I found doing a quick search

"External balance applications feature a removable hub in order to accurately blueprint the engine and balance the assembly. These products are available in black epozy or polished steel with an epozy clear coat."

Sounds like it still needs balanced to your rotating assy. Not just a install and go.
Found it here

https://www.rebelperformance.com/pr...0-sfi-rated-fluidgeltm-7-25-damper-black.html