A friend of mine has a 396 with what we think is 671 blower on top. The problem we have is that we dont know what the base ignition timing should be as none of the specifications we can find down under list big blocks. Most books stop at 350 as this was the BIG engine down here. I realize the blower will make a difference to standard specs. At the moment it seems quite happy at 10 deg advance. :confused: :confused:

1938 1/2 ton Hope to drive it before I retire