377 with extension boxes?
 

Have the opportunity to upgrade to speedmaster 4's with extension boxes. Anyone know of any 377's with 4's and boxes? Or if it's a good idea or not?

The 1988 38' Scarab KV called Nasty had 572's with #5s on boxes.
https://cimg5.ibsrv.net/gimg/www.off...8048ce8bc1.jpg
https://cimg6.ibsrv.net/gimg/www.off...07cda3d094.jpg
https://cimg7.ibsrv.net/gimg/www.off...0c806fe0c7.jpg
https://cimg8.ibsrv.net/gimg/www.off...ad0bd6f5d4.jpg
https://cimg9.ibsrv.net/gimg/www.off...b1acfb700a.jpg

How did the “nasty” run