When you use the ls1 intake, the truck water pump doesn't fit. There are 3 spacing for the accessories. Fbody, vette, and trucks. There are tricks to read about (mix and matching from different vehicles) but you may be best to look for a set of brackets used. With a carb setup, you won't need to mod the tank BUT you will need to add an electric pump. I had an external electric at first...ugh...nnnnoisy! In tank is the way to go but I don't know how you'd regulate pressure for a carb.