That cost is the engine alone at a salvage yard where I live...not to mention the intake I would need to use my carb on a Vortec is another $300-400 plus gaskets...not to mention transportation costs of that engine because I or anyone I know owns a truck...not to mention I would need to buy an engine stand and an engine hoist to remove and replace both engines...not to mention I don't own a garage or private space to do an engine swap and keep these tools around...
$350 for the Comp Cams camshaft kit I posted, financially trumps doing an engine swap even having to buy gaskets...even tearing the motor apart with it in the car and replacing what I can is cheaper than an engine swap...in my situation.