I'm pretty sure A heads were never a production head, only B and C. Unfortunately there aren't any intercooled pd blowers for the b head. Kenne bell makes a non intercooled kit I don't think whipple makes anything . I do have a set of navi heads here if you wanna make the c switch otherwise grab a centrifugal and don't look back.Correct me if I'm wrong but they do not offer anything for the A or B style heads. Man I wish they did for A heads. I would be very pleased with an 100ax.