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The C-4 is an easy install if you use the kit from Flat-O-Products in Oregon. I've installed two of them with flatheads. Speedway also makes a kit, but I have no experience with that one. I think the Speedway kit uses the larger torque converter. Use the stock Ford-o-Matic rear end or replace with a Maverick. You need a ratio in the rear around 3.25 to 3.45 for good power and cruising speed. You can also install the early Ford AOD.