This has been sitting in a boathouse in an old wooden boat for 30 years. The boat had pretty well rotted away and the guy I got it from had to hire a crane to reach down to the boathouse and lift it out. It's a 656 block with 333 heads a 3830831 intake for a 340 hp 409. It has a rochester carb with tag 7023183 which shows as a mercury marine. The dist is a 1110637 which is also marine. The block front pass side has TIII88R stamped on it. The dist has packard plug wires with date of 4-0-64 on them.