If they haven't been started in a week. I pull the aircleaner lid and fill my Holley fuel bowls through the vent tubes - the Quadrajets only get a splash of fuel down the throttle bores. Both then fire off as soon as they turn over.
FWIW The later Holley equipped LT1's 71 - 72have phenolic spacers to take up volume in the fuel bowl in -order to lower the amount of fuel which evaporates to the atmosphere, thereby reducing emissions.
Here is a photo of one I picked up for my LT1.
![](https://lh3.googleusercontent.com/pw/ACtC-3fGTeGtnAozYUzdeuNmzp-PAhR0DowU9X3V8LMQXTRC7ns5KnpaCo7DTJ94Ni_fcZT8UuWMyLwRIIlw5W7W0IcE7vww_YLrr0AhMTQpLliQo3lg3p-AHS5WiQMloqHXXIClcm_IMqcBwWSxssw9PXuAtg=w1179-h884-no?authuser=0)
![](https://lh3.googleusercontent.com/pw/ACtC-3fB_XX1CHFcpDCfQyhfEixmkKMACGMAJpMO6AsspLdtyB39PfNCPLk486kvDHB3YLr8xgztQrgLocQFwCtr-Zq-XXpYDv5gB4cCtkNNpp3gj-9fqFPZS7kPYUZt9mI1bbFLeH5HRjJrNAeg3557taxYLw=w1179-h884-no?authuser=0)