You want to tune this car? Are you going turbo, nitrous, or high compression N/A? p13 basemaps will be fine unless youre doing any of the above.
VAFCs are not as precise. They alter the input from the sensors into fooling your ecu into throwing in more/less gas into the mix. Plus they are no good for ign. timing changes.
If you already have a socketed chipped ecu, all you have to do if you do go turbo/nitrous/high/low comp is have a tuner make you another basemap once you get the mods on. Then drive it to get a street tune from a tuner.