See any red flags with these vehicles?

[MTCK]

What are you going to use it for? Driver? Try to restore to stock? Show truck? Off roader?

I like the K5's, both appear to be A/C trucks with the dashes uncut where the stereos go. Is the brown one a 4 speed? That would be my choice if you're going to drive it / use it. The front fenders might be trimmed a bit, if you look the trim does not extend all the way to the bottom on the front or rear. I love those classic slot mags.

The two tone appears to have the original 203 and drive flanges as someone pointed out. I've blown up a couple 203's. Never any trouble with a 205 or 208. Granted I was abusing the 203 but I abused the others too... Interior is cool.

73 is a cool year. Like the grille and 205 / auto combo. Looks pretty rusty in those other pics but floor pans would be the bigger story. Not sure how valuable a 383 is. Could be, or could not be depending on how it was built.

All three have pretty big tires. If you're going to use them off road, might check the axle gears. Neither the 203 or 205 has a low low range (both about 2:1) so if they have highway gears they might be slugs. Of the three 76-78 chevs I've had, all three had 3.08 gears. Let us know what you get. Nice trucks.