This is a completely refurbished hs4 aud 52 carburetor set with new mb needle and fully refurbished by the well respected Joe Curto, owner of British Superior. All parts needed were replaced with new. The complete package includes all gaskets (preinstalled) new air cleaners, primed, rust proofed and high heat paint, manifold, and heat shield. Also heat shield spacers. This is the original carb used in 1962 and 1963 mgs and has none of the smog add ons used later. The unit can be installed without disassembly by simple removing the current pre 1974 1/2 set up and bolting in the replacement. This is also a preferred replacement for zenith carb, or Weber carb. It brings back originality and adds performance. 1974 1/2 and up cars require pre 74 1/2 exhaust manifold. The carbs are preset for ease of installation, but do require tuning. Please ensure that your distributor and valves are properly set prior to installing. Also i suggest having the Haynes Mgb workshop manual on hand for assisting in the tuning. The air cleaners do need to be removed in order to balance the front and rear carbs