dash question?

[Woodnears]

I hope it is ok to post in here! I bought a 68 chevy c20 for my first build!
first question........ Whats the best way to remove the dash as to get at the firewall? I have it unbolted but seem to be stuck on the pinch weld at the window joint! I have removed the cab and front clip the rest is going to the crusher! I have a few donor trucks as well one is a short bed frame and one is a long bed. I am looking to build this truck as a slammed and bagged short bed. looking at a porterbuilt setup all around. It has a straight 6 right now and i am really digging the inline 6 for now. Has any body ran a 6 backed by a turbo 350 and a 10 or 12 bolt rearend? I am new to this stuff so please understand my ignorance! The plan is to build this truck so my son will have a bad ride to school! This will be a complete frame off resto and completely modified truck!