I used an engine/trans mount kit. There's plenty of room for the turbo 350, but the firewall to HEI distributor clearance is tight. Still, it works fine. The only real issue to going with a v8 was having to reconfigure the steering box and front shock mounts. The v8 won't fit with the stock steering column, so I went with a power steering kit and a tilt column.
The front shock mounts have to be reversed (left side mount on right and vise versa).