Intake Velocity Speed of 565 CID w/850 Holley?

I have been tinkering around with increasing vaporization of fuel for some time now and found someone willing to test one of my protos on his 565 CID w/850 Holley that he runs at 6500 RPM as a max. I'm not sure what type of intake he is using, but I need to know about what speed the intake will be flowing through the carb. at 6500 RPM.

His car runs 6.65 in the 1/8th.

I have made a proto for a 360 CID with only a performer intake and took it up to 4300 RPM with no restriction what so ever. But I am going to have to do a re-design to reach 6500 with no restriction, so I need some idea of either how much more air/fuel mix flow will be passing through the carb on his engine compared to mine, or have some idea of how much air/fuel mix will be flowing through his carb at max RPM in some way that I can understand how much air/fuel mix will be flowing or at what wind speed it will be flowing. Basically I don't know how much velocity I am dealing with and I need some idea to design the proto correctly.

Any help is appreciated...