The 283 and SM420 are original as is the rear end, I don't know if it's 6.17:1 or the 7.20 but the engine doesn't need a 2 speed rear - plenty of grunt with this set-up, top speed against the governor = 45mph
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
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