there were a couple places that used to make blower manifolds out of carb type manifolds--it entailed cutting away every thing except the area around the ports and weld a structure together that was very much like the true blower manifolds and it let many people put 6-71 type blowers on some ngines that Cragar,etc didn't make manifolds for-----I don't remember for sure but it might of been Gary Dyer near Chicago-----yeh---he makes rods now