MSD Blaster 2 Coil question

Probably to best match the ECU with the turns ratio and resistances. Racing oriented coils are often better at higher rpm but sacrifice at lower rpm. Other coils are optimized for CD ignitions instead of inductive ones. You could try to ask MP tech line what the specs are and then find a coil to match. Good luck getting an answer from MP (I never had any).

If you look in the Engine Book, the Chapter on Ignition lists the recommended coils and resistors for a whole bunch of P-part ECUs. IF the part number goes back to when that bulletin came out, you will have an answer.

edit: Added the "Book"