Biggest record I could find is from my own area, where I spent many a summer watersking: Nassau Bay Tx(Houston), a 186 Pound alligator gar. On 30# line, no Less! That is about an 8-9 foot gar at least.
As a kid living on the Mississippi Gulf Coast, I remember 200# plus gars being weighed in at the Fourth of July Fishing Rodeo, but they caught them with wire line.
(IGFA World Record Gamefishes, 2000)