It's turning out my rebuilt '57 bird 4150 style holley(1273 ECZ-V) is kind of a mutt, biggest issue i see is that it's using #109 butterflys which should be on something like a 600 cfm. It already has the right linkage and seems to cover all the passages right though so i'm almost debating on using it. Is this going to cause issues? I kind of feel like having a step between my body and base plate might cause idle issues since the idle mixture is in there.