This unit was purchased a while back for a project that never came to fruition, has been sitting on a shelf, includes box and all rpm chips and everything in picture.  Never mounted or installed.  

Brand:MSD Ignition

Manufacturer's Part Number:6420

Part Type:Ignition Boxes

Product Line: MSD 6AL CD Ignitions

Summit Racing Part Number:MSD-6420

UPC: 085132064205

Ignition Box Output: Capacitive discharge

Circuitry: Analog

Rev Limiter: Yes

Timing Retard: None

Data Acquisition: No

CD Voltage Output to Coil: 450-480 V

Current Draw: 1 amp per 1,000 rpm

Spark Output (millijoules): 105-115 Millijoules

Minimum Operating Voltage: 12 V

Maximum Operating Voltage: 18 V

Length (in): 8.000 in.

Height (in): 2.250 in.

Width (in): 3.500 in.

Ignition Box Color: Red

Coil Included: No

Warranty: 1-year

Quantity: Sold individually.

Notes: Even-fire only on V6.

CARB EO Number:D-40-26 (pdf)

To see a list of qualifying vehicles, enter CARB EO Number D-40-26

Description: These MSD 6AL ignitions are the perfect choice for the street or the track. The powerful capacitive discharge, multiple sparks ensure complete combustion of the air/fuel mixture to increase power and performance. MSD has taken the proven performance of the 6A and added a rev limiter. The soft touch rev control will protect your engine from overrevving. Adjustments are easily made with plug-in modules, so there are no dials, switches, or programs to deal with. At your selected rpm, the soft touch begins dropping the spark to some of the cylinders, and on the next cycle, these same cylinders are fired to prevent loading up with fuel. The result is a smooth and accurate limiting action without backfires or roughness. They'll work with virtually any 4, 6, or 8-cylinder vehicle with a distributor, as long as it has a 12-18 V electrical system. They include rubber shock mounts and modules for 3,000, 6,000, 7,000, and 8,000 rpm.