NHRA told me that the head that Edelbrock sent them for the Big block mopar will be legal for all casting numbers for the B&RB engines from 1960 on up. The 452A mopar alum head will be legal as well in stock.
I am waiting on an email from Edelbrock as to when i will have the first sets in hand, i dont know for sure yet on the production date.
Erik Jones
Jones Engine Development
www.jonesenginedevelopment.com