Well if the fuel bowls leak then it will be hard to start because it will have to pump gas out of the tank till the bowls fill back up,and i don't think you have a q-jet if it has fuel bowls,if its off a 74 vett you have the Have the Holley quadrajet replacement carb its the Holley version of the quadrajet i have one of them and there easy to tune carbs there is no float adjustment there pre set its pretty much jets and A/F screws witch are easy to adjust if you have a vacuum gauge