SBC Intake Gasket - 18 Degree 1971-plymouth-fury-iii-esi9678518 Fitting - Hose End -

Fitting - Hose End - 2000 Series Pro-Flow - 30 Degree - 12 AN Hose to 12 AN Female - Swivel - Aluminum - Black Anodized - Each

400 in Backspace - 5 x 115 mm Bolt Pattern - Beadlock - Aluminum - Black Powder Coat Center - Machined Lip - Each

Muffler - Rumble - 3 in Center Inlet - Dual 2

00 Thread - 30 mm Long - 8 mm 12 Point Head - Chromoly - Black Oxide - Universal - Set of 5

Maybe the throttle shafts are worn or a screw has become cross threaded

SBC Intake Gasket - 18 Degree 1971-plymouth-fury-iii-esi9678518 Fitting - Hose End -Intake Manifold Gasket 0. 062 in Thick 1. 265 x 2. 18 in Rectangular Port Composite 18 Degree Head Small Block Chevy Kit