oil leak from heck!

[carkrazy1987]

Ok so Im working on a friends truck and we are having one heck of a time getting rid of an oil leak. Alil background. 1994 s10 with a 383 sbc vortec. So far what we have done.

Balancer seal is leaking.
Replaced balancer seal. Still leaking
Then replaced plastic timing cover. Still leaking
Removed cover found double roller chain rubbing on cover, replace cover and installed hd timing chain. Still leaking
Replaced balancer. Still leaking.
Installed a sleeve to balancer, still leaking.
All gm parts used.

This is were we are at. Next option is maybe to try an aftermarket metal cover. Any ideas?