1951 coupe flathead to C4 adapter

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After much trial and error over the past year with my 51 clutch chatter I have thrown in the towel and found a 74 C4 had it rebuilt. Now I’m having trouble deciding on an adapter for my flathead. I have been on a waiting list fork over six months with Flatomatic. Gene has had health issues and problems sourcing torque converters. My question is Speedway has an adapter kit and everything I can purchase. How is it compared to Flatomatic? Or should I just be patient? I would like the opinion of you experts. This is my first Flathead.