That is one thing that can be said for the days of Leyland, Vauxhall and Ford vehicles, the days when they turned to rust as you watched but they created a generation of good gas welders who learnt the art of turning rust back into metal and bridging some wide gaps as many panels never really fitted, I learnt a trick of feeding two rods into the weld pool using a 7 nozzle as low as you could get a stable flame to fill wide gaps and like many moved onto MIG and then TIG.The fit up ranged from zero to over 7mm over 35mm