Early A-body trivia!
157#'s of fluids? That seams a bit high doesn't it?
Gas weighs about 6# per gallon. 18 gallon tank?
A 50/50 mix of anti freeze weighs about 9.33# per gallon. 4 gallons?
10W30 motor oil weighs about 1.6# per qt or 6.4# per gallon.
80W90 gear oil weighs about 1.75# per qt. or 7#per gallon.
Dot 3 weighs about 2# qt.
Add in the battery acid and washer fluid and I guess it is plausible.