What a coincidence, I'm about to do the exact same thing. Contact
Patrick's and request a catalog. They have an excellent article on the swap in there along with a lot of other useful information and some excellent goodies you might want for your truck.
There are a lot of vendors out there selling parts but my two (other than Patrick's) favorite are:
Classic Parts formerly known as Chevy Duty
and
Bowtie Bits EXCELLENT prices and rapid shipment
Good luck!
