Got engine serial numbers yesterday.2135412, is that a 270 ci? Also E180, hard to see with mirror.Head is 2193417 R, with date code E4-0. Intake is 2193425. Tranny is Clark 5 speed-202V323,for GMC No2227792. SN 514 79P. Has a Waterous PTO B046. Do any of these numbers help narrow it down to 1950.