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And they are really easy to tune. and MUCH more tunable than the eddy or cater carbs. a 750DP is much more carb than the 800 thunder. Before you give up on the Holley read about it.

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THe AVS 800 carbs are awesome on the streets. A Thunder 800 avs will provide more than enough on a 440 as a bolt on. The secondaries are mechanical, makes a 4 speed car feel like its performing better.

The 850 DP won't be happy with the higher/lower numerical gearing 3 series. 850 Will dump too much fuel for a mild cam. with no converter slipping it can be more sensitive to DP bog. Hollies also seem to like single plane manifolds. THE AFB/s , quads, and q jets seem to like dual planes.

Owning about every carb, here there is a luxury to try them out and setup what works best. And for what purpose. 600-850 edelbrock AFB/AVS/Holley/demon.

A hughes 2330 or 3310 hyd cam are fine , 223-230 duration .050 and .480-530 lift. If you have the compression at least around 9 to 1.

Performer dual plane/ or weiand action + with a AVS should be killer. With a 3.23 gear and 4 speed all the downshifts and up shifts will be at perfect times for spirited driving.

Keep the mechanical seconaries with the 4 speed. Just don't squirt as much fuel. It don't have a 3000 stall 850DP's will dump too much.