Carb Questions

So, the 429 is topped by an Autolite 4300 carb. At sea level it ran great, up here at 7,000+ feet it runs rich and performance sucks (but the engine sounds great). I have a couple questions:

1) I've been told the carb needs to be rejetted for high altitude. I know I have to retune it but my experience with carbs is minimal. I've got a bunch of books I've been reading, but they are lean on 4300 information. How tough would doing this stuff be?

2) Should I look at investing in a better carb? I've read very mixed reviews on the 4300 (it was rebuilt ~10 or 12 years ago and only has about 50 miles on the rebuild).

3) For the 429, does the 4300 flow enough or should I look at a carb that flows better?

Note: I'm not looking at racing, just cruising. Also, MPG's are good!

Hmmm...nothing?

A Holley 3310 will give improved gas mileage over the factory autolite. It takes a little work tuning but is worth it, and parts are plentiful. Just my opinion

Thanks guys, any suggestions on where to buy? I've been looking at Summit and Jegs, any good (reputable) deals out there?

Increase the ignition timing by 4 degrees and run gasoline with 10% alcohol in it.
That will usually get it near the right place.