"The valve body plate only has the number 373 punched through it."
The "373" plate is a separator plate sold thru the old direct connection program which converts a stock VB into a REVERSE MANUAL. Along with the plate, you needed to mill passages in the transfer plate, remove all the check balls except the large 11/32" ball, and remove the shift springs and block the governor plugs with 1/4" round stock. Refer to the old Direct Connection racing manual for details.
http://www.moparts.org/Tech/Archive/auto/18/bulletin18a,p16,trans.JPG
http://www.moparts.org/Tech/Archive/auto/img/bulletin_19_torqueflitemods_12.jpgJohn Kunkel has a pic of the transfer plate with the milled walls.
Hope that answers your question.
