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Will a colour tuning kit works on my m38?

If you are referring to these kits: https://www.gunson.co.uk/product/G4074

Colour tune kits were meant for hi-performance engine tuning usually associated with motor cycles, race cars and boats with conventional spark plug leads.

You could adapt one of your plug leads to a convention lead for the colour tune kit set-up but I think it is a bit too much up at the high end of performance tuning to have any value on a 60 HP engine.

Out of interest just came up on You Tube, look at greendot319. Then select tuning the engine by looking inside while its running. All about the colour tune kit this chap put on his WW2 Jeep.

It is a mind titillating game for a younger mind to play but it has little value with 50 & 62 HP 4 cyl engines. Any trained technician following the old fashion manual directions for a L or F 134 tuneup will end up at the virtually the same settings.