I did the Mustang tank thing on my 51 Chevy truck. I ended up using the stock pickup but flipped the sender upside down (remove and reweld it). You will also have to solder in some resistors between ground and your sender wire to calibrate to the Chevy gage because the #ord sender is 70-10 (now 10-70 after being inverted) and your gage is 0-30. Only problem is that it isn't accurate at empty. Mine works pretty good until about 1/8, then it can't be trusted; time to fill er up anyway. Let me know if you are interested and I can give you the details. I think a better choice would be to get your hands on a chevy sender and figure out how to attach it to the #ord pickup.
good luck

'53 chevy 3/4 ton