The small turbo and large turbo Esc Cos run different ECU setups which require different triggers.

If your fitting a cosworth engine to your 3dr you would want the large turbo type ECU lowest form of a L6 ECU.

This uses a 4 trigger CPS
and also the phase sensor from the Dizzy.

If you dont want to use the dizzy for the phase sensor you an use the GrpA version which is a cam sensor fitted to the camcover which picks up from an extra shaft fitted to the inlet cam.

Or the other method is use a cam trigger disk off the front cam shaft pulley with a custom bracket and sensor.

Hope this helps a little, if not i could have a chat with you next time im down your road

Regards
Jano