Im looking into the z car and doing a swap v8z however I have a question on the two transmission options from what I have researched the automatic is more "drivable car" with a v8 is this true??

There is a couple of weeks worth of reading on this subject at hybridz.org Not trying to chase you away by any means, just offering up a site that has more specific information. In general however, having done a host of conversions, none related to the Z, the auto is more driveable and is an easier install from a mechanical standpoint. It is all a matter of what you consider "driveable". With an auto, put it in drive and go. That is why grandma always had an automaticLOL