Honda-SOHC

Steve has  a few listed - his prices are sensible.

https://www.400fourbits.co.uk/#electrical

I know this guy but haven't seen him for years
100% genuine bloke though

https://www.ebay.co.uk/itm/335388847413

You could use them to put up some virtual shelves for ornaments that don't need to be bought Ted 

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Anyone have a spare 400/4 points plate with the sub plate for points 2/3? My sub plate is a shocking fit on the main points plate and so adjustment is almost impossible.

Very interesting within Honda, is that they've built so so many different types in configuration and application, all good to compare design traits etc.

The three mentioned above all allmin the same area in regard to bhp per cylinder, more importantly loading (torque)  and speed all being close to specify a bearing for use in.

The detail in your thread about prototype 750, the small original big ends suggest it either started as a roller bearing crank or sized upward 8f origin in plain bearing, to control crank twist perhaps. 
Around that time were the car engine 4 cylinder too, with roller bearing crankshaft.