A stock oilpan would come out without much hassle,but a Moroso pan might be larger capacity and hit the crossmember under the motor--in that case you will have to raise the motor up a bit,remove the 2 thru bolts in the motor mounts,and raise it some until enough clearance is obtained.(you can use an engine hoist,or a jack under the pan with a peice of wood to spread the load so the pan wont crush!--then you can put blocks of 2x4's under the motor mount brackets to hold it up when you remove the jack--slide the thru bolts back in so the blocks can rest on them)...
Take off the distributor cap first,or it will likely hit the firewall and crack when you lift the motor up--watch the fan too,make sure it does not catch the fan shroud--it might have to be removed as well--also watch the radiator hoses and any wiring that might get stretched when you lift the motor...I had a lower hose pop off while I was under the truck doing an oil pan swap once--it was not fun getting 5 gallons of prestone flushed down my pants..expensive mistake too--cost another 25 bucks for new antifreeze....

...also,I'd avoid jacking the motor up using the harmonic balancer--I did once and it flew apart a few days later,and the motor vibrated so bad I had to tow the truck home...

--be careful under there!