318,summit 6901

6901 is a rebuilder cam- you can get it from Elgin and others cheaper same as Edelbrock cam- neither is where it's at as far as power
take a look at the lobes on page 4 of this thread and makes some comments
440 rebuild
no way do you want to go with cams that are bigger than the 340 cam (which would almost be a better choice- I'll explain the almost if needed) for your build
as for the converter comment above- I agree
did you say what your compression ratio is and cranking compression?
btw there are several "268" cams seat duration is more than you want with what you have to work with