603 run without turbo installed

[dieselbenz1]

I am reviving an old project and want to find out as much as I can about this engine a scrap yard find. I wish to run this smoking engine without the exhaust manifold on to observe each cylinder. I have the exhaust manifold off and turbo so can I

1) block the turbo oil supply line

2) just feed the supply back to the sump directly

3) choke some oil supply and returnto sump.

I have a spareoil supply I could modify.