Dealing with tarred sheet metal '39 cpe

[Newc]

Hi all; I am cleaning a '39 cpe shell for restoration and this is a real 'tar baby' between factory undercoating everywhere and secondary actual 'Tar' application in the trunk, I wonder if I'll ever get the metal ready to even blast. Its good solid Idaho metal, but a blaster can't do much with 'Tar'. Dipping is a cost and transport problem. any Ideas? Photos here... Newc in Oregon