So did it run ok with the oko or did it run like shit too? That set up is not really the easiest to tune, both the 72cc and 74cc kits have their own issues. For both of them you usually have to stack a shit load of base gaskets or a metal spacer to get the compression ratio close enough to run more than a block or two before shutting down. You could also turn that head on a lathe too, but most people don’t have easy access or the tuning know how to correct it.