i just need to stir the pot a little,just read the click hear thread.never had a B60 but got a 58gx2 it spins a Biela 24-8 on a ES pipe at 7340.and that is new out of box and not tuneing the header length or the carb it was at factory settings. don't know how long the 58 will last but it's a screamer for now.the B60 is a time proven engine design it will last a long time,but i don't think it can keep up with the 58 at lease the numbers that i have seen. i can't spin a 23-8 on the 58 because it would put it outside the recomended rpms of 7500.
ENJOY!