Bob, I have the Indy 426-2 and the 426-4 that I bought off of you a while back. My deal is to try to run the single Holley 850 carb in NHRA/IHRA SS and the couple of NSS events around here. It may not be practical to try to run both with the one intake and carb combo, or may be too much of a compromise for either. I'd use the NSS events as a test session on a slick track. We have maybe a dozen cars that run it around here and only a few Hemi cars. Most of them are wedges. Mark Howes ran the single 4bbl several years ago using the 426-2 and he said it was a dog under 6k RPM. It looks like it would be a better low RPM manifold than high. He won an IHRA race with it but didn't like it. Hard to step down from the crossrams and two carbs.