re-usable distributor after swap?

You are going to have to piece it together for a \6.

You can get a rebuilt distributor for a \6 at most any parts store.

The same for the ecu they are readily available and there is no difference between 6 and 8 cylinder modules. Also, there is no real reason to by a performance module for a \6 since the only real advantage to the performance ones is the higher rpm and a 6 only fires 3/4 as often as an 8.

You will need the harness which can be had by cutting it out of any 6 or 8 cylinder car/truck in the junk yard or purcahsing this one http://www.summitracing.com/parts/DCC-3690152/