WIW 340 exhaust heat riser kit

The 70-71 big block kits are worth more.

Here’s one 70-71 in a Mopar box that actually sold for $185 shipped

SOLD - 3420046 Heat Riser kit 383 440

Without box and being 68-69 BB you’re looking at under $140. Then add $20 for the extra thin weight. ~$160 Shipped.

For $617 you can buy brand new manifolds, coated, WITH heat riser installed:

Exhaust manifold set fits 1968-1969 383 and 440 high-performance | Roseville Moparts