None.

Wire everything as per the Haltech instructions. The distributor is not needed at all.

Phase sensor is only needed for proper sequential injection and/or ignition.

You can easily run batch fire and wasted spark with just a sensible crank trigger like a 36-1.

You cannot do this with the shitty Ford 4 tooth crank trigger only. In this case you will need to retain the distributor for a phase sensor along with the 4 tooth

If you reach out to Clint at Brands Hatch Performance, he might be able to supply you with a suitable base map or assistance ( for a fee I would think, it's his business )

He offers various kits

https://www.shopbhp.com/collections/...-plug-play-kit