My car might be a tribute and will never ever be a real Hertz, but being the ever fussy one. I am always trying to improve on what I have to make it even more correct. I just got a new carb for it. Holley have reissued the correct carb for the 66 Shelbys, it is a 715cfm Lemans carb....take a look.
when it arrived it had a broken fitting but the supplier has sent a replacement, so should be right to fit in a week or so!