MY 27FT CATALINA, 1977 VINTAGE WAS NEVER EQUIPED WITH A BOOM VANG. WHAT IS THE BEST LOCATION FOR THE MOUNTING POINTS ON A NEW INSTALLATION? THE CENTER LINE OF THE BOOM IS 39 INCHES OF THE DECK AND THE BOOM LENGTH IS 11FEET AND THE SAIL FOOT IS 10'6". I MADE A SPECIAL FITTING THAT WILL ATTACH THE BOOM VANG 3 INCHES ABOVE THE DECK WHICH ALLOW CLEARENCE FOR THE SLIDING HATCH. BARRY