I'm selling my Offenhauser small block Chevy crossram intake manifold with both tops, one for single four barrel and one for dual four barrels. I ran this for several years on my 39 Chevy with no problems. I only used the single carb top. The dual top has been used, but not by me. The linkage for the dual top is included (see the pics). All of the threads are good. I don't have a gasket for the top, but they are available. The front three holes in the manifold and the single top have been enlarged to 3/8 -16 thread, because that's where I had my A/C compressor mounted. I ran this with the single top with an HEI distributor. Distributor had to be slightly modified, but just to relocate where the wires came out of the side. Tight, but it worked. Base manifold # 5893 Single top # 5901 Dual top # 5903 Linkage # 5902 Shipping will be added to the $850. I'll need your address to determine the shipping cost. I won't ship to Alaska or Hawaii. Domestic shipping only.. When it sells, I will send $50 to the HAMB. PayPal only unless you want to pick it up at my house (Kansas City area).