[Gaz64]

That could all be correct, depending on the colours of the two springs.

If one is black, and the other plain(silver), one carb is still factory stock, one is jetted on a dyno, A/F logged through out the session etc.

A friend of mine, and my car were on the same dyno, same day. Operator did not believe they could be so different. I said his IS stock, mine looks stock.

I run a 850 Annular DP (custom carb) on my baby engine. No Vacuum secondaries for me.