Hello Romik!!!
Wonderful project, and your driver choice is perfect, Salonen drove very impressively against Group B Turbo-4WD beasts.
I believe that you would find better engine base from this kit:
http://www.ebay.com/itm/AOSHIMA-1-24...309373#vi-desc
It's a FJ20 engine in that kit, but I have understood that it is same as FJ24 of RS240, just a bigger bore. At least the valve cover is identical.
Good luck with your project!