Just to update since my 441 build is done. I'm now at 564/516 at the rear wheels. It doesnt' seem like much more but through a 4L60e and a Ford 9" I don't think it's too bad since I did run a 10.46 at 131 MPH the first time at the track. Also got a 6.4 at 110 MPH through the 1/8th before I got the boot for not having a bar!
Traver