• 3 If the dispute only relates to the location of the actual boundary line as determined by the subdivision plat, and that line can actually be ascertained from existing survey pins, then the actual survey will prevail over a parol agreement. ( Wright v. Hendricks (1944), 388 Ill. 431, 434-35, 58 N.E.2d 453, 454; Darter v. Darter (1980), 91 Ill. App.3d 322, 325, 414 N.E.2d 862, 864.) However, the present case appears to be based not on the actual surveyed boundary, but upon a claim by the Dobrinskys to the disputed tract determined from the 400-foot measurement back from the western edge of lot No.