Chevy trucks went to independent front suspension in about '60. Also, they all had 6-lug patterns up through '70 or '71. Chevy passenger cars also had 6-lug pattern up through 1947 or '48. In '49 they went with independent front end... The back of the spindles look like Chevy and the tie rod ends look like the ones GM used back when... My guess is it's a late '30's - early '40's GM, but not Chevy. It could be Buick, Olds, or Pontiac as they all used the 5 on 5 pattern since the 1930's.