Reply to "Seam welding and strengthening for racing"

The weak spots are where panels overlap and are only spotted together, as below the tail lights, at the vertical leading edge of the inner rear fender panels (up thru the rubber insulator channel) and at both ends of the windshield posts (these last also need doublers welded in). Then do all the crossmembers in the rear subframe, and add doublers where the lower front subframe rails attach to the tub. Along the way, I'd seam-weld every big panel I could reach- especially the outer fenders and the whole roof. You'll likely have to paint-strip the entire car to do this, and anyplace where you find popped spot-welds is a red flag that that area was overstressed, so it also needs seam-welding. I'd suggest doublers where the suspension a-arms fasten to only thin sheet metal tabs- these have cracked under racing stresses with giant tires. Good luck- you'll have a truly super-car once this is done!