Set/move engine down and/or back.

[novaderrik]

you don't need much room for theo il pan- 1/4" shouldbe fine. just don't plan on taking the oil pan off in the car.
at the firewall, ideally you'd want enough room to get the bellhousing bolts out, but depending on how easy you like things to be, you could jsut take the motor/trans out as a unit instead of just dropping the trans, or cut access holes in the firewall with a hole saw to bet to each bellhousing bolt and make some sort of covers for each hole. there is also distributor clearance to think about- but the firewall could be pounded out of the way or a notch welded in for clearance.
once you've got the motor down and back, then you need to think about header fitment and collectors scraping on the ground, as well as driveline angles unless you also drop the trans crossmember the same amount as the engine.