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i havent heard of any steering mods being necessary...

booster is a matter of preference to require less pedal effort when braking.. although i dont think you would fit a booster in with the fj unless it was remotely mounted..

most difficult mods would be transmission tunnel, and getting your brake master/clutch to fit in whilst clearing the fj's intake..

i dont know much about the fj conversion but i have seen some fj 1200's with remote brake master cylinders.. and others with custom or alternate intake plenums used...

good luck