When I did the 850 front pans, the fuel line was in 3 pieces with bits of clear plastic tube joining it..
I flung it away, welded the floors and then bent up a new 5/16" one using steel fuel tube. Robbos etc sell it by the metre and it's easy to shape.
Don't forget the brake line and starter cable on the other side...
On that side I dropped the brake line out, made a new one of them too. But you can just push it down, and put a bit of steel sheet over it while you're welding.
Make sure the car is sitting on the ground, level, before you cut.
Do one side at a time.
Tack weld it first. Then finish welding it before cutting the other side out.
I welded mine underneath as well, after I put it up on a spit...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
