need help on raising ride height

hi I recently bought a 79 camaro as my first project car.
however the rear sags.. eventhough i replaced the shocks
witha gas shock and my leaf springs are fairly new..
what can i do to raise the ride height.. should i just cut large
block of steel put holes in them and install it like a washer
for my leaf springs... I really want the rear to raise up higher
than the front for bigger and wider tires... well thank you
and if you can show me a pic of your construction it be really
helpful...

Get a re arched set of leafs that have a larger arch than the old 1's.

I think you should have invested in a set of air shocks rather than the gas ones.