This carb comes with a flow design adjustable spacer/adapter and fuel log. WCD80583-1 – New Holley casting that provides an additional 5-8 HP over 4412 casting. Screw-in air bleeds, Teflon coated throttle shaft, and stainless steel butterflies. The best carb for IMCA Southern SportMod and SIMS Stockcars and Limited Modifieds. This carb. is $695 new.