[Old H2S]

I do not know about a Known Ratio for runner length, but Mopar used the Cross Ram intake on the 413 CID V8 and had 34" long runners from the 2 carbs to the opposite bank of the engine in a large criss cross I will try to find a pic, it worked quite well but was too expensive to make and weighed a lot.
The old Pcar set up with the Holley were using 4 barrel 5600 types, and the smallest ones are still too big CFM wise. People over carb frequently and with a manual transmission carb CFM must be matched to engine flow closely. A 5000$ carb set up on a 911 is nice but do you really need 45mm bores for 8000RPM use when your there for mere milliseconds before shifting? What are you doing? Drag Racing? Driving around at 180MPH? Buy a Cup car it is cheaper.