[BR3W CITY]

The Doug Thorley's were the first "made to fit" longtubes for the c10 swaps. He's got all the part # listed on his site. There are a couple different versions for larger primaries also if you need the extra flow (tighter clearance tho). I think its the 324-y and 323-y that you'd be looking at, but check there to be sure.

There are a few others that work also, but they all have slightly different fits. Keep in mind things like motor position, how low you can go below the frame, your steering shaft will all affect the "perfect" fit.

The google search part up top still works, but its not nearly as good as the in-forum search. Still, if you find the part #'s for the DT headers, you can find threads and builds who have used them if you plug it into the search box.