Reply to "Seeking Carburator Recommendations"

As was mentioned, if you want high speed performance, use a 750-any-type. If you want moderate performance with good driveability around town, use a 600. A 750 will add roughly 30 bhp and drop 4 miles per gallon with no other changes, even if you drive the car the same with both carbs.
Some guys try even larger carbs (usually with drag racing backgrounds). One Pantera owner went from a 750 DP to a 950 Dominator. He reported the engine made much more noise, less power and gave 9 MPG. Want to buy a cheap, lightly used Holley Dom?
Note that ANY DP carb new-in-the box will be jetted quite rich. Holley expects owners of these race-type carbs to tune them for specific uses and they know one cannot easily blow up an engine running rich. So warranty returns to Holley are far less this way; but they simply don't work at optimum without extensive fiddling.
Some of us use 'tuner-carbs' which are 650 or 700 DPs that have had 35 or more major changes done to them specifically for street driven Panteras. Pro tuner shops that sell these usually dyno each carb on the same type of engine they will be used with before shipping them. Cost= about $750 USD. Mine actually gave a small power increase over a 750 vac-sec, was more responsive at low speeds and gave 20 mpg @ 90-110 mph continuous touring speeds, over several 800-mile runs. It was a bolt-on with no fiddling needed. Now 10 yrs old & still working fine.
I recommend tuner-Holley carbs- they do everything throttle-body injections do except barometric compensation & a slight mileage gain, at 1/3 the price. I won't live long enough to see any fuel savings from a $2000+ TBI setup, at 20K miles per year. FWIW-