[Buzz]

Bobcat, I had the same problem. Getting my Holleys to run well in one range always seemed to cause problems in another area.

I chose the 650cfm carb. I have a stroked small block and most calculators showed that to be adequate for my displacement and RPM range. The overwhelming majority of my driving is on the street so satisfying throttle response and driveability are my priorities. I think the 800cfm unit is recommended for big block applications.

One of the neat things about these carbs is the adjustable secondaries. I haven't played with mine yet as I'm just plain tickled by the way it runs as is.