Yeah, if you're not a great tuner it's best to get a short needle carb.

The long needle requires perfect balance between gap, lsn and hsn. It's also pretty sensitive to plugs, proper shimming, fuel, and outside temps and humidity. Even with the short needle the Go engines tune from the gap and LSN first instead of a more traditional hsn method (like OS).

In general, if your engine is performance ported and transfers efficiently it'll be more finicky than a standard engine. Just get a short needle and be patient with these go-based engines. They're totally worth it!