American Motors: 1964 Rambler classic, small block chevy, torque tube

Question
My car has the 287 V-8 w/flashomatic trans.How feasable is trading out to a small block chevy & tranny? Would I also have to change the rear axle?

Answer
How feasable is subjective.
If you have the money and time, anything is possible. It is NOT a simple drop in and bolt up. You will have to modify the motor mounts and engine compartment. The driveshaft will need to be modified, also.
As for the rear axle, it might work with anything, unless it has a torque tube.