True 460 Marine engines came with a Cobrajet (CJ) intake, CJ oil pan, 216/220@050 camshaft, D6VE truck rods, fully-grooved main bearings, and an alternate valve spring set. Depending on the actual year of production, it may or may not have forged flat top pistons (usually the late '80's and up in the King Cobra 460 Marine engines). All of this becomes more questionable since the engine is now remanufactured.
It is very unlikely that the engine is reverse rotation...but it is possible. If it is a reverse rotation engine, then it will have a gear drive that turns the camshaft clockwise while the crankshaft spins counter-clockwise. In order to convert such an engine to clockwise rotation you need only a timing chain and camshaft (and of course new lifters, etc). If the engine is standard rotation then you don't have to change anything, not the cam, not the heads, nothing. However, it may be internal or external balance and it may have either dished or flat top pistons, and you need to determine these things before installation and certainly before a C9VE head swap which would put compression aroun 11:1 if the engine had flat tops.
Given the amount of time it has been sitting, I would recommend negotiating under the premise that it will be necessary to at least partially (if not fully) disassemble the engine for inspection, cleaning, and reassembly. I have seen rebuilt engines that were stored for a long time and had corroded cylinder bores, and even be frozen solid because they were assmembled with white grease that solidified over time.
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Performance Components for the 429/460 Engine Family