1. You will want the 2.2L head off of a Turbo II engine. Best would be to find one from 88-89. You can get them off any Chrysler, Plymouth, or Dodge with the Turbo II.
2. I am not sure of the valve sizes. I have never machined my heads. I'll ask around for you though.
3. The Laser with the Turbo 1 is mechanically identical to the Daytona you are looking at. An 88-90 would be better years. If you can find them.
4. The A-555 and A-568 are two different manual transaxles. They are racing transmissions that came stock on any Turbo II "A-555" or Turbo VI "A-568" car from Chrysler. They were designed by Chrysler and built by Getrag of Germany. They are heavy duty and reinforced.