Do you have a Bristol 30 that was made in the 70's?
http://www.bristolowners.org/30/bristol30.html
http://bristolowners.org/30/bris30.jpg
I'm not sure how much coaming space you'd have to change the position of the winches?
If you have a photo handy of the cockpit, it would help.
When the conversion was made from the tiller, did they they use and Edson conversion kit?