Hypercoils 6" OBD Coil-Over Spring - 2-1/2" I.D. - 750 lb. 2110012 offset +45 and the hub

offset +45 and the hub bore is 78

For Factory Manifolds use Downpipe Kit # 81075

S2 Sportsman / Dirt Grand National / Straight Up / Fiberglass Sportsman

Holley Single-Plane EFI Split Design Race Intake Manifold - Square Bore - Single Plane - Aluminum - Natural - GM LS-Series 300-290

Hypercoils 6" OBD Coil-Over Spring - 2-1/2" I.D. - 750 lb. 2110012 offset +45 and the hubOptimum Body Diameter (OBD) Hypercoils feature a unique design concept that adjusts the body diameter of the spring relative to the end coils. The OBD design enables Hyperco to take full advantage of its ultra high tensile material by optimizing the applied stress through adjusting the spring's body diameter. HYPERCOILS because the most important race is the one you are in. Hyperco is a supplier of precision engineered, high performance suspension