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Top looks like a 400. It will be casted into the side of block down by the oil pan. Bottum looks like a 440. It will be stamped into the flat pad on the left front just in front of the intake. Also a 440 is a RB like a 413,426, the 400 is a B like the 383. and those Don't have the flat pad.
Tuff to tell with all the exc/drive cuttering it up ? As for the bottum not close enough to tell ??
I see the truck mounts now on the top one.
You bying or just looking ?
If you are getting the intake and carbs tossed in, you stole them. The "key" to a B (low deck, 361/383/400) vs an RB "tall deck" or long stroke (413, 426, 440) is the tall deck has the horizontal engine ID pad, which is actually visible in the second photo. Low deck do not have it in that location
For a "quick id" most all have the CID right there, either partial or all, IE 426, 26, 42, sometimes the numbers are not "clear" stamped
I can't see it in the top photo, hence it may be a low deck
Top picture, sure looks like a stamp pad to me between the ac cover and valve cover, partially covered by the plug wires. They both look like RB's to me.