Moss has a kit now. Back in the day, there were two or three major aftermarket kits. Shorrock and Judson are the two I remember. Eaton might have made one.
But for the weak crankshafts, the engine was well suited to these. 8-to-1 compression, small valves, etc. Shorrock claimed TDs could achieve a blistering 90 mph with the supercharger bolted on. I suspect that translates to about 70, maybe 75, horsepower.
About what we get with a nicely sorted 1776.