If it's flooding you should be able to tell from the black smoke and smell of the exhaust. I assume you mean it starts only with the enricher on... you said it only cranks with it on.
You probably have partially clogged idle passages in the carburetors. There's a small chance the idle adjustment screws have been misadjusted too lean, so you could try setting them back to the stock 2.5 turns from closed and see where you stand.
Welcome to the board Tumas!
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