Alright folks, here is what Ive gathered so far after looking at this tank and parts diagrams. Here is what I really think you all going to need. I will modify or update this later once I make the swap, but will be slightly different for me since I got a good bit of parts already.
Here are all the parts and costs I found for them that I believe you will need as the parts diagrams show them as different part numbers for 33gal tank vs 23/26gal.
---------------------
68408876AC - 33gal tank #1 on diagram (fuel tank) $411.60
68312139AB - Hose Vent #4 on diagram (fuel tank) $40.65
68312140AC - Hose Fuel Return #5 on diagram (fuel tank) $30.86
52030458AB - Strap Fuel Tank #8 on diagram (fuel tank) (Third strap needed in addition to the two existing from 26gal $20.07
06104717AA - Nut Flange Hex #9 on diagram (fuel tank) Need this for strap above $2.53
68307831AA - Tube Vapor #1 on diagram (hose fuel) (Mounted to drivers side frame rail) $20.76
52029908AB - Hose Purge #2 on diagram (hose fuel) or #3 on diagram (vent canister) (Cannot reuse 26gal one, too short) $31.35
52030443AB - Bundle Fuel Line #4 on diagram (vapor canister) $44.72
52029888AB - Canister Vapor #5 on diagram (vapor canister) Shows different part number from 23/26gal $103.53
52029909AC - Hose Filter to Canister #8 on diagram (vapor canister) Shows different part number from 23/26gal $13.57
---------------------
Thats 10 parts I see. The cost on all that is $720 or so before any tax or shipping. Probably will be easily over $800-850 if shipped with tax. Im attaching the diagrams as well as I reference them in the information above.
I know for me looking at my tank from the junkyard, Im going to need the 52029909AC since that didnt come with it, and will need the 68307831AA, this one I know I need cause that vapor line right now is against the drivers frame rail and its going to be too long and will need this part number to accommodate the quick disconnect fitting on it. Then I will pull my tank down and hopefully compare some parts to see if my list above holds water or not, but according to the diagrams, it seems like they are needed.