Need advice on purchase

20 seems high....need more info...motor info, rear end info, brake upgrades?? I sold mine for 17K, survivor, low mileage 318, 4 bbl, auto console, HD 2004R overdrive auto, 3.90 gears/posi, power steering, power disc brakes, A/C, new bumpers, custom interior, 302 heads, 340 manifolds, dual exhaust, no rust ever anywhere, no body repairs ever:

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Hey man thanks for responding. She's selling three cars all of which belonged to her boyfriend I believe there's a 66 charger this cuda and something else. Anyway she doesn't know anything about the car but it is a two-owner and I believe that's a 318 v8? Not sure