the turbo i had on was the .63 t2 (the largest t2 rear) not the .64 t25/28 rear. it had a pulsar t28 turbine machined into it, it also ran a cosworth t3 comp housing with a billet t28 comp wheel similar in size to a pulsar t28.

yours will probably be a t2 hybrid from turbo technics as im 99.9% sure they did one with the 63 rear.
get a t25 or t28 front end on there and a larger turbine machined into the rear and you will have a turbo good for 230-245bhp on the little 1.4