Engine Factory built my engine (390FE) in 2004...after install, RM seal started to leak almost immediately. Not wanting to remove the engine and send it back to EF, I went to a pro shop to get a repair done. Leak slowed down...thought I had it fixed, Leak is back...
I examined the crank journal, no
oil groves on seal surface. The crank is correct rotation, but may have been machined. Will have to try a rope seal next.
Engine runs well, however, I also ended up replacing the Edelbrock Carb with a Demon as well as MSD ignition vs the standard distributor.
Wouldn't say to stay away, but would send caution.
Hope it helps!