Ultimate Headers are beautiful works of art to fit with LT4. Owner Jim is really helpful and got me a set a month ago to go in my 70 Camaro. Can call to see if they make a set of headers for LT4 into your C2.
Ultimate Headers
Jim Browning
440.234.9600
216.496.1974 (mobile)
Agree with Oleyeller. Dirty Dingo has some nice stuff. They are across town from me in Phoenix area. Bought their motor mounts for my LT4 going into my 70 Camaro DSE build. They aren't quite done with their LT4 accessory drive kit yet. I found a nice accessory drive setup from Street Shops in Alabama for my wet dump LT4. Not sure if any of that works for a dry sump motor. Tray is a helpful guy there and even included custom black plating on the pulleys at no additional charge. I'm expecting delivery this week.
Street Shop
Tray Walden
(256) 233-5809
www.streetshopinc.com
Might check your crossmember and see if you can even fit a LT4 dry dump oil pan int your stock frame. Wet sump might have a slightly easier pan design to work with but still may require modification to fit stock.
Good luck with your build. Should be a great driving car with the LT4 when you're done.