I cant help you with the manual for solex's, in my opinion, u should ditch the solex's anyway...
But, for the tuning, the 18RG twincam doesnt need any special tuning, it would be jsut the same as the pinto. Twin carby's, u might have meant, cause thats more important when tunning it.
If u dont get a better reply, basically what you do it, get the engine to idle on 1 carby, then the other one, then back them off together. Then do the main jets the same way. Proper multi carb tuning is done with vacuum readers and pressure sensors and fuel mixture sensors, id suggest taking it to a dyno shop to get that done.
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