If you are talking about fuel supply/return to the fuel rail, the '86 IROC I did used regular fittings. You should be able to find these at any NAPA or large parts jobber. I would use steel if possible. Are you going to fabricate your own lines? The lines must be flared. Or you can use AN fittings and braided steel hose.
To set the initial ignition timing, you use regular idle speed and disconnect the PIP signal from the processor. Timing is controlled by the processor and a performance chip has to be installed to over-ride it. This is not to say that you can't bump up initial timing.
Hope this helped.