I have a '77 V-20 cuddy and mine is mounted to left side of the steering wheel. You are correct, there isn't alot of room to mount a unit. I know I have to look down at an angle to view mine, especially when its in split screen mode. Before you drill any hole, check with Bass Pro Shops....there is a flyer I got in the mail this past week featuring Lowrance (Mine) and Hummingbird models...they also showed ads for mounting posts -being able to re-locate your unit instead of the usual mounting spots. I know I'm moving mine once I get my mechanics straight.
Check with them on-line as
well as Cabella's and Gander Mountain before you drill & mount for a spot you don't really want