Brad
Look in the January 1931 Service bulletins there is a large writeup on replacing the Victoria top. Also, MAFCA's new Victoria Body book has some information on installing the top.
The following is a portion of an article in the Victoria Association Bustle
Step 8 - When everything is properly fitted and clamped into place, you can attach the top ribs to the top inner rails with #10 x 1" countersunk screws. Attach the rear cross bow to the left and right outer rails by drilling pilot holes up through the outer rails into the cross bow, then install two #10 x 2" flat head wood screws. On the original installation, the inner rails were attached to the top side metal panels with special large flat head nails.