Depending on what year the donor truck was the sender assembly will be different that the earlier years , i.e , it will be a pump assembly and will not fit the earlier tanks .
If I was doing the conversion I would run a aftermarket Walbro 255 such as the GSS340 or even the Airtex E3270 will be fine for your swap , both should be less than $100 depending on where you buy.
I am not a fan of external pumps , they are in the tank for a reason , keep it there .
TOM
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