Hi, I have a 260z with hitachi flat top carbs and I put on round top SU carbs and kept the 260z intake. I had to modify the linkage but your swap will be pretty easy I think. I got rid of all my emission stuff as well as the water that runs through the intake as well as the idle compensator with no ill effects. I can send you some photos if you like. I no longer have the carbon canister or egr hooked up and swaped out an early non egr top piece to bypass it altogether. I ran an exhaust manifold that had the heat yubes removed and ends plugged.