[Bobboloo]

There were 2 versions of the E cam. The first one in 69' (only) was actually a Solex cam.
29 BTDC
39 ATDC
39 BBDC
19 ATDC

Your car should have the 2nd version which came out in 70'
20 BTDC
34 ABDC
40 BBDC
6 ATDC

In 72' Porsche retarded the same E cam by 2 degress to

18 BTDC
36 ABDC
38 BBDC
8 ATDC

Lift at TDC overlap was set at 3.0 to 3.3mm in 70' and that was changed to 2.7 to 3.1mm in 72' when the cams were retarded. So 2.9mm lift at TDC overlap would be what you want.

Keep in mind that the right side of the motor, cyl. 4 thru 6, are a 180 degrees opposite the left side, cyl. 1 thru 3.
So when the left side cyl. 1 is at TDC with both valves closed on #1 then the right side is at TDC overlap on #4 and vice versa.

The numbers you gave above are way off. Are they 180 degrees off?