I run a 512. Some atreet use but mainly track. I run a comp cam. Part # 23-703-9. I dont run FI or PB but could easily and have considered changing over if I decide to drive it more around town. In gear I have 18" of vacuum. Idles very well w/almost no lope. Have ran a 4150 and 4500 Holley with no difference in drivability.

In comparison my brother runs the same cam in his 440. He has approximately half the vacuum(9-10").

I'm not as smart as many on here but I feel the extra cubes tames a large amount of duration. Youwill love your combo.