Try and trach down a late 70's escort or cortina 4 cyl with the 2 litre pino motors .. these have the 32/36's on them - and they dont take much to fit up to a celica as you probably already know
you can buy rebuilt ones but ive only seen ones from suppliers for over 300 bux ..
Im now actually running a single 45mill sidedraft on my ta22 - and its a ripper - another option to look at if you want a bit more power to play with, and a more suiting performance carby