I have a 98 z28 that I'm going to swap out the stock LS1 intake and throttle body with a weiand intake and 80mm bbk throttle body. Is it just a simple bolt on swap if I don't have the EGR system? The throttle body will also connect right up without any modifications, correct?

 

how much are you spending?? the weiand is ony as good as the stock GM LS6 version, so that might be cheaper, unless you plan to port a lot, or add nos??

it should bolt up but there may be an issue with the coolant lines the early ls1 run under the manifolds crossing each head. You can get back block off and a front crossover tube if you want to.