What kind of documentation for used engine would satisfy you?

Eight years ago I bought a 1971 340/727 combo complete from fan to yoke and from carb to pan. It was pulled from a 1971 Super Bee by a restoration shop because the owner wanted a Hemi put in the car. The shop owner had it on a pallet and he spun the crank with a socket and breaker bar. He told me that it was sold “as is” and he recommended that I pull the heads to find out the real condition of the cylinders if I bought it. The price was $1200. I bought it.
When I got it home, I pulled the plugs and used my bore scope to find that it contained .30 over pistons with 4 eyebrows on each piston. The cylinders had some visible cross hatching left on the walls. The heads were small valve later heads.
I still have to pull the SP2P-318 intake to get a runout micrometer on the lobes of the cam.
It seems that the previous owner took his 340 and tried to make it get better gas mileage by choking off the top end.
I figured that I did ok since I already had a complete set of 1971 Large valve J heads, 1971 factory intake, an LD340 intake, ThermoQuad, TRW .30 over pistons, and a selection of different cams to go in it.