leave the boost at standard boost, drive there gently, then piddle your actuator when your there then get them to fit it with a simple mod list like that youll be fine to drive unmapped for 2/3 hours if your sensible.
in all seriousness you will pay £500 for an p&p ecu, + £20 delivery + £60 for a dyno run to check it is actually fueling right the TD emange offer is a seriously good offer at the moment plus your guarenteed perfect fueling and a btter ultimate power and delivery of that power from a custom map
Simon think about it A 9j at a reasonable offset it going to hit caliper, spring and probably bumper mounts points A general rule for the starlets 6-7 you'll be ok 7 depends in the offset and tyre choice (probably arch work) 8 will require stretch and arch work (probably extended arches) 9s probably not gonna helm without serious work
The big end bearing has went within the engine hence the reason for the cheap price. To fix this requires either engine to be replaced or stripped and rebuilt. Do not let 'Terry' scrap this!