Bowhay the throttle blades have numbers on them ...and unless you have a spread bore carb the front and rear will be the same. Hard to troubleshoot from the internet but you cvould have the wrong gaskets or something causing an internal leak or something...I know Holley rebuild kits will often have several different sets of gaskets and you must match them up with the old ones .....I would put it all back exactly like it was and see if the trouble goes away...then start from there.