thanks for all the help,I will begin to check all the possibiltys I have been given,it is a 21 stud ,and does have a elect. fuel pump,has org. distribitor,with the adapter to use regular 6 volt coil,I under stood that this eng has no timeing marks and it timed by special machine,and that advance is controled by machanical weights , that are not ajustable ,is that correct ,as you can tell just bought this truck,and not up to speed on flathead yet. Thanks to all Dave