I have a GT350 the previous owner removed the vacuum hoses from the engine compartment. I'm replacing the hoses, but wanted to see if someone has photos of the house routing to the motor and where it should pass through the firewall. Thank You!
On my 68 500 vert (auto & a/c) this is where it routes:
Looking over the carb toward the cowl, there is a hole in the firewall below and between the driver side export brace holes/bolts; This is where the larger vac hose comes through.
Under the passenger side outer export brace hole/bolt is a firewall hole that the smaller hose routes through.
Hopefully this description will help you. This matches other similarly equipped cars I compared.