Toyota:
I4. 3SGTE
I6. Supra
V6. GR series
V8. twin turbo UZ
Subaru:
H4. Crawford Performance
H6. EZ30R?
Mazda:
rotary...lol
Nissan:
I6. RB26
V6. VQ**
Honda:
I4. Why?

V6.
Chevy:
V6. Camaro V6
V8. Camaro V8
Eventually somebody is going to swap another engine into the car. The ones that share the Aisin 6 speed transmission are prime candidates. Toyotas that use this transmission are top of the list. I'm talking about you, GR.