Take your pick from these rule books which contain all the race car construction/specifications and the rules and regulations for Spedeworth International Ltd promotions.
1993 Incarace Car Construction Rules & Regulations 56 page A5 Oval Racing
Stock car racing magazine Spedeworth Stock Car and Hot Rod March 1970
78x vintage Wheelspin Magazine - Spedeworth Stock Car, Hot Rod & Banger Racing -
SPEDEWORTH STOCK CAR JOURNAL MAGAZINE ISSUE NO 1 MARCH 1965 VGC SCARCE
SPEDEWORTH STOCK CAR JOURNAL MAGAZINE ISSUE NO 17 JULY 1966
SPEDEWORTH STOCK CAR JOURNAL MAGAZINE ISSUE NO 18 AUGUST 1966
