Super nice score!! I hope you got the TCM with the trans. I know Chevrolade did a 90E conversion.
I'm sure Nelson can help with the harness and tune. Motormounts can be found off ebay.
Before you install it, I would recommend adding a converter. They are expensive for the 6spds but well worth it.
Also any plans for a VVT cam??

There are some threads on here with list of connectors/splice's/sensors you will need.