The t25 is way small for the KA hehe I would say the max would be on a 2L engine. The z32 300zxTT uses a t25 for each of its 2 1.5L sides to put it another way.
Another cheap alternative would be a coolant and oil cooled t3 out of a z31 300zx turbo. I dont know the best year off of the top of my head but Ill try to look for it.
Ill be running that or a t3/t40e, and I also want to be rather cheap. But it sounds like your going about it the right way, cheap but reliable (fuel is one of the biggest things alot of people skimp on for low bost.)
Dont forget the fuel pump either
