I do have a part listing for the heat riser valve kit, computer shows I should have one in stock, but would need to check to make sure.
Heat Riser Valve - 340/360 exhaust manifolds:
These New Chrysler exhaust heat riser valve kits are for 1972-73 340 and 360 RH exhaust manifolds. Kit includes the counter weight, shaft, vavle plate, anti-rattle spring, valve stop, thermostat (coil), 2 bushings and 2 seals. Instructions are included. Valve plate (butterfly) is 1-13/16". Arc welding of the valve plate is necessary. Installation also requries a lbs.-ft torque wrench.
TM-83947 Heat Riser Valve $ 98.95 kit
I also offer these parts as well.........
Exhaust Manifold Bolt Retainer
New Chrysler small-block exhaust pipe-to-manifold bolt retainer. This retainer is mounted between the bolt and exhaust flange. When the bolt is fully tightened the tab folds over to prevent the bolt from loosening. These retainers were used on cars starting after Dec 2nd, 1968 (1969 model year) to 1974 on small blocks only.
RS-404043 4 are required per car (1 per bolt) $1.95 each
Exhaust Manifold Studs:
New Chrysler manifold studs. Each stud is for use on all LA (273, 318, 340, 360) engines. Includes both 5/16" -18 and 5/16" - 24 stud ends.
IN-T532 All LA small blocks $3.50 each