Just a side note, I have had great success with Summit Racing when returning or asking for refunds. I can understand their reluctance to accept the distributor due to it being an electrical/electronic item and having been mounted and run on the engine.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy