I did notch the frame slightly in the rear by the crossover flange, but I'm not sure I would have had to. I looked through my pictures and I don't have any showing that. I used high pressure rubber hose for the fuel system and Dorman fuel rail adapters to the stock fuel rail and regulator. There is currently no vss and it runs great, but I still plan on putting one in sometime. If you don't use the vss you'll get a high idle code, but it can be shut off in the programming.