If you use Edelbrock springs, have them tested and install them at whatever height gets you to 130-140 closed pressure. It would appear that Edelbrock has at least a couple of different vendors for that spring and they def aren't all the same. Don't assume they are the same as the spec in the catalog. Sometimes they are, sometimes they aren't.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
