I would go with a 600 holley vac secondary hands down.You dont need anything bigger than a 600 on a 390,the smaller bores will give you more torque.Ive run both on 390s and the holley is easier to tune and you wont need a adj fuel regulater like the edelbrock.If it were mine id prolly run a 570 street avenger,they are sweet carbs.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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