throttle bodies

I got told the other day that the tc throttle body is ristrictive just want to no if that is true??? all so if i put solid lifters in on standerd cams would i get any gains on a c20xe???

bought for a project that i no longer need them for and a lack of money! Trumpets (lip of one end trumpet, cyl4, folded down to allow to fit) Jenvey Bodies Jenvey/SBD Manifold comes with Bosch Cream Injectors aswell £600ono pictures up soon to