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Hello.

I've got a Scag Tigercub with an FH580V. For starters, i've got fuel, spark, and compression.

Recently I split the crank case in half to redo the seal as the engine was puking oil. Upon reassembly and putting it back together it ran for a solid 2 minutes and quit. I've tore it apart and I've checked my timing. The marks on the crankshaft and camshaft are aligned. I cannot make the engine even start off of starting fluid through the intake. Interestingly enough I can spray starting fluid in the exhaust and it will start, run, and die. Would this indicate my timing is 180 degrees out even though the markings are lined up as every manual I've found online has instructed? Any help would be appreciated.

Yes.
The crank does 2 revolutions for every 1 of the cam shaft.
You have set the valve timing on the exhaust stroke.

The other easy mistake is to cross over the pushrods.
Pencil down the plug hole and watch the valves with respect to the position of the piston

If it ran for 2 minutes I doubt you have timing issues.
I'd look at the flywheel key, maybe the flywheel isn't tight and the key sheared.