Hooker supercomp fenderwell header 5208

After looking at shipping rates FedEx is cheaper if i have an address or use a neighbors a couple of blocks makes no difference. If I just put in the zip like the 1st guy shipping was 97.00 after picking a random address 74.00 to west coast plus commercial address is always less.

I also found this in an old hooker catalog

Hooker Super Competition Full Length Header - Painted
64-69 Barracuda, 64-66 Dart/Valiant(A & F Bodies): 273-340, Tube 1.625" O.D. x 43", Collector Size 2.5" O.D., Collector Length 8"

5/16” machined flanges for a perfect seal
Industry’s best welds for durability
Designed for optimal performance
All necessary hardware included for a complete installation

Part# 5208HKR
Can anyone tell me what is the difference between 69 dart & 69 barracuda engine compartment.