Whilst there is a dizzy on the end of the camshaft, the question is what would control the engine spark timing advance/retard without an ecu?

Yer you are right its from a granada, scorpio. Not a sierra though they only made dohcs in 8v format.

Hope you can find some more info out about the engine, I gave up and just chucked it out for a simple pinto. But One thing I do remember is that I ragged the crap out of the twin cam for 3 years and it never burn't oil, never let me down once. Toughest engine I ever had. And had real good low down torque.