[dsraven]

it seems like the fix might be to massage the firewall with a large ball pein hammer in the area where it is hitting the engine, then level up the engine some, which will give more room for the dizzy because the engine naturally moves away from the firewall at the top as the rear of the engine is lifted. you may need to watch the clearance under the floor for the trans/transfer case as you do this and also the engine front pully, not sue what you have for clearances in these spots.
if you need to fab a whole new firewall consider a steel wheelbarrow bucket, they are naturally rounded and may compliment the look under the hood and inside the cab that way. you could likely find a cheap one on kijiji. otherwise cut out what you need to in order to make it right the first time and then figure out how you will cover that hole after. remember to leave room for the gas pedal and your foot when doing this. it needs to be comfortable to drive when done.