Wow, that's very kind of him. Didn't you buy this car off him more than 10 years ago?
Should be able to find Rb26 throttle bodies relatively cheaply, lots of people remove them for modern drive by wire set up etc.. forward facing plenums are also quite common, but i'd invest in genuine "Greddy" ones, not the "Freddy" ones. :).
I really dislike the cross over intake on the RB25s.