Fill only thru the the dry sump. If you want horror stories search Corvette Forum for folks whose C6 Z06's had a grage or worse a stealership add oil through the valave heads instead of the dry sump, and ended up with the oil change hydrolocking the engine.
see horror stories here
http://www.corvetteforum.com/forums/...nightmare.html
and here:
http://www.corvetteforum.com/forums/...il-change.html
this is from corvette forum on how to change a dry sump...
http://www.corvetteforum.com/forums/...ump-specs.html
and from Halltech performance:
http://www.corvetteforum.com/forums/...procedure.html