250s are passenger car motors and 292s are truck motors. Not to say that you couldn't put a 292 in your wagon though. I would go with a 250. That's what I have in my 69 Buick and I love it. Rides smooth and gets like 16-18mpg driving easy.
69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.
