Just curious did the 340 have a cast iron 4 bbl intake manifold, a 2 bbl cast intake manifold or no intake manifold when you got it ?
And I suppose it is hard to tell now, but did it have a flywheel (hint manual trans cast iron or aluminum bell housing) or by chance a flex plate for an automatic transmission.
Flex plates use the short crank bolts, flywheels use the long crank bolts. Can tell if they left the bolts in the crankshaft. Also crank may have a pilot bushing in it for manual trans or an in out box for an industrial drive.
Someone may have retrofitted that industrial engine to go into a car after the overhaul mid life with the .030 over TRW pistons.
The thing with the industrial application of running a water pump, generator, or being a stationary power plant is that it could have been designed to run at a constant 2000 rpm where high rpm vibrations are not much if an issue. So was built it without the vibration damper.
A 2 bbl carb would have worked good in this scenario.
Could measure the grind on the cam too if you pull it out, could have been a low lift for industrial application with a 2 bbl carb.
Or maybe was just built with the traditional 430/444, 268/276 340 4 bbl cam.
Cam could have been easily switched out during the .030 over rebuild too.
More pieces of the puzzle, see what you can find out . . .
