I recently picked up a mirror 105 block 390 fe, I bought it for very cheap thinking it needed a rebuild. I took it apart and everything was rebuilt no sludge or anything on the inside of the motor. But back to the point can any of the veteran FE owners shed some light on this block for me? I am trying to get it to a 400hp and 450-475 tq range. I guess this block has the reinforced webbing that is desired for performance use.