I had a customer try one on a 470. He was running a 400-2, but wanted to play in the NSS stuff. 4 speed car, And he used Ede carbs. I seem to think the big problem he had with it was a stumble right after the launch. I don’t recall there being a big speed difference at the top end between the two.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads