BHJ Dampers = Good or Bad?

I am using a BHJ dampener on my 1970 340.It is neutral balance non SFI.It is a quality product with good customer support.I had to mic the snout of the crank and then mic the inside diameter.Since I live in Calif,I contacted BHJ with all the info.They honed to fit the dampner to the crank.I paid for the shipping but they didn't charge me to hone the dampner.I believe that's the way they make the dampner hone to fit.I would have no problem using there product again.Hope this helps.If you have any more questions feel free to contact me.