changing the pan gasket how hard

[cjoenny89]

My pan gasket is leaking bad in my 68. It has a 327. I am assuming it is the pan. The engine sat for 25 to 30 years with the occasional start up after being rebuilt waiting for me to get old enough to get the truck from my dad and finish it up.
Anyway It appears the Pan gasket is leaking around the hump in the front under the harmonic balancer.
With it being 2-wheel drive is it even possible to change the pan gasket in the truck with it being so close to the front cross member?
Is there enough room?
I know it has the 4 piece cork gasket on it and it appears to be off center like the gasket slipped. I bought a 1 piece gasket for it.
How hard is it going to be to change the gasket?
Thanks