8) you can use the summit adaptors since the 2100 autolite and the 2300 holley use the same bolt pattern. i have the summit adaptor on my 66 falcon using the 2100 autolite. i have mine facing as it would be on a V8. to do this however i had to swap the bellcrank to the V8 one rather than the 6 cylinder one. i also had to clearance the adaptor to allow for full throttle operation, and i had to bend the lower return spring eye to clear the valve cover. when you bolt your carb and adaptor in place you will likely find the same interference problems i had, minor though they are.