the start of the Dart clean up

Sounds like you have a full plate. So do i. A 67 barracuda notchback, 88 daytona shelby, 69 barracuda notchback (kids future project) , and a mild refresh on my 94 chevy sliverado i bought new. I have spring clecos, and "draw" clecos (wingnut type).for automotive sheetmetal i'd recomnend a mix of draw and spring clecos. The copper colored are 1/8". Brown tool sells the "button" or spring clecos for about $4.20 a dozen.and "wing nut" or draw types for about $2.00 each. Plyers for spring clecos are about $5.00 so these are really a great investment.

In my aviation job the clecos are sized for different nominal sized rivet shanks to keep existing drilled rivet holes or new rivet holes perfectly lined up when changing out aviation metal frames and such, but for automotive sheetmetal they work great to pin and hold stuff together prior to welding.

I recommend clamping and drilling for the cleco pins then pulling the pieces back apart to remove the burrs from drilling then repin with the clecos to draw everything tight prior to welding. Also i recommend using 3M weld thru ll on any steel sheetmetal pieces that are overlapping each other where you plan to weld. Its like a spray on zinc coating to help prevent rust.