Am i crazy or am i on to something here?

What is in the car now? Do you have to buy swap parts? My reasoning for suggesting the magnum,
you can get one that is 10 years newer than any la engine.
They had better rings so the they cylinder walls are going to more than likely be in better condition.
They had efi all their life, again the engine will be in better condition.
Roller cam stock, you don't have to worry about a worn out 50 year old cam.
Make decent power stock.
Don't cost much more than an la to get.
Put That Air Gap Intake And Headers on A 5.9 And You Be Close To 300hp.
Some guys like running electric pump better with this crappy gas so I don't see that as negative. id bet you can sell the 340 and have enough cash to buy a magnum, headers, intake, carb, and maybe even flywheel.
No it won't cost less than an la, but you want a drop in running engine, it makes sense to me.