This topic can be one that brings out some hostility in people, so I'll try to be careful. I've got a bunch of Holleys, 1 Carter and 1 Edelbrock, and soon I will be buying a Barry Grant Demon carb.
In my opinion if you've gots lots of power and you need a carb over 800CFM you'll need to go Holley or the Barry Grant Demon carb. Personally I think that Barry Grant did some good things to upgrade on the Holley design with stronger metering blocks and main bodies and, as such they come with teflon coated gaskets and power valve protection. Holleys on the other hand can warp the metering blocks and the main bodies. Holley recommends their "sticky" gaskets to seal properly and that's what they come with. Except getting those things off with a power valve change takes time and patience.
Edelbrock just came out with their 800CFM version of the Carter, and I have 2 of the 750 CFM carbs, one a true Carter and 1 is Edelbrocks version of the Carter. I like these carbs alot. I don't run them on the car at the track because I need more CFM, but if I could I would try. The Carter is on my other car and it really responds well. It is super easy to tune and jet changes are super fast. Well not that your actually changing the jets, but the metering rods, which affect the jetting. Plus a quick change of the spring at the power piston and you've changed when your power circuit comes in. These carbs have zero gaskets under the fuel level, so you can't have leakage into the intake manifold. The power valve circuit cannot blow out. And on Holleys, a blown power valve means your dripping gas into your intake, and down into your cylinders, and washing them down.
So, my opinion is if you want a good, reliable, low maintenance, low cost carb that's super easy to tune, get a Carter or the Edelbrock version.
And, the manual choke version is jetted richer than the electric choke version. In the Edelbrock catalog they state the manual choke version is jetted for maximum power and the electric choke version in jetted for maximum fuel economy. What you can do though, is get the manual choke version, re-jet the primaries (if the 750, use .110 jets), and get a new set of metering rods (if the 750, 75x37) and you can have the best of both, your cruising circuit will be set for max economy, but the power will be set for max power. I've done this with both my Carter and Edelbrock carbs and it works great.
[This message has been edited by BIGDOG454 (edited 02-16-2001).]