The 22 engine bay is slightly smaller then the 23 and 28 I think, so you are more limited with the choice of engines. You could try and shoehorn a 1G-GTE in there as it's a common transplant into 23s and 28s. Best bet for my mind is to put a 4A-GTE in there. It's also a common enough conversion that there are plenty of people (Toymods or Twincam) that can give you advice. In the ACT there are a couple of classic celicas running around with 1JZ-GTEs under the bonnet, but this cannot be registered outside of the ACT due to engine restrictions for light weight road cars.