My breakers that works power to two rooms keep kicking breaker off right away I have everything unplugged from outlets in both rooms how do I test to find a short or what the cause is put new breaker in already

Ok, so I probably know the answer already about most likely needing a new wire set ran from the breaker box, but wanted to check first. House was built in 1987. I am replacing an old Roper electric cooktop that had a black wire, red wire, and bare ground. The breaker is a double 40 amp. The way it was hooked up prior Black = Black Red = White Ground = Ground The new cooktop has a red, black, white, and green,, here is the model number of the cooktop: GJC3655RB In the info it states the below: [url]https://assets.ajmadison.com/ajmadison/itemdocs/8286066-D-WH.pdf[/url] "Electrical: A 4-wire or 3-wire, single phase, 240 volt, 60 Hz., AC only electrical supply is required on a separate, 40-amp circuit, fused on both sides of the line. Use 8 gauge copper wire." [attach]105544[/attach] So I am wondering it doesn't mention 120/240, but just 240, does this mean I that I do or do not need any further wiring to hook this up? Also, in the diagram for the wiring, it shows red=red, blk=blk, but then it says white&green from cooktop to white(supply), one I don't have a red in the supply, two the white was hooked to red in the old setup... [attach]105570[/attach] [attach]105571[/attach]