as seabiscuit said, wait until you can afford it. Bet the missus wont be too happy if something screws up.
But if you have your heart set on doing it now.
Chop 1.5 coils off the front for 325mm hub to eyebrow
and flip the 2nd leaf on the rears.
with the front at 325 the rear should be around 320- 315 to get the rear sitting pretty.