Measure 28 times, insert once

Step one, chain the engine, hoist it and measure existing tranny crossmember to existing mounts, then measure new tranny mount to new engine mount which happened to be 38.5"

The Engine

Driver side measurement

Passenger side measurement

Driver side stock mount location

Passenger side stock location

As you can see the distance from the firewall to the stock locations is close, but due to the chevy distributor curse, the mounts will have to move forward