Its a 37000 series Dual Point ,a later model with the Big Cap and the plate on top , that is Not a cover its a support for the shaft / Bearing Plate , they will rev to 8000 no problem ,( as long as the Bearings are good ) very stable , uses GM style Points and condenser , I have a Chev SB / BB 37000 series Dist at my shop now , a very good unit