Any way to add A/C to 1967-1972 truck without cutting holes in firewall or dash?

[HeavyHauler]

Every once in a while I think about wanting A/C in my 1968 Chevy short bed fleetside. But the thought of cutting the firewall or the dash prevents me from doing it. My truck never had A/C from the factory but it does have factory 396 with 400 turbo transmission with black paint and red interior.