Lenard? not sure which Otto brother it is?
Pretty sure they use East coast Pro stock rules, and its 9lbs/CI with minimum weight of 1300lbs for stock head stud pattern and 1350lbs for non stock head stud pattern[WBX/Autocraft/ pauter etc 4inch bore & bigger]
Found this link might help you
http://ecpra.com/WP/pro-stock-rules/Most of what I have seen is 4inch bore and bigger, roller cam and vacuum pump
cheers Richie