I’m swapping out the 302 in my ‘67 for a 408W. Just a couple of years ago I installed a rebuilt harmonic balancer (3-bolt) from WCCC on my 302. It probably only has a couple hundred miles on it. I think this balancer will bolt up to the new engine… both engines are 28oz external balance with a drivers-side pointer. Any thoughts on whether it will hold up to the 6200-ish rpm redline (or any other reasons this is a bad idea)? I like the look of the stock balancer/pulley and would like to use it if possible.