Hey, this is kind of a late reply, but I figured I would give as much info as I can. At this point, I am assuming you may have completed this by now.
I am currently installing the RH Fuel Cell and Radiator in my 1979 911SC. My application is slightly different because I am fitting a turbo Subaru 4 cylinder into this car. I am also 3D printing a lot of custom brackets to secure the radiator in place.
1) Unfortunately, I do not have an answer for this one as my car currently has no mouldings at all.
2) I am using this 90-degree brace as the bottom mount. Initially, I was going to weld it in the car, but I have switched directions and am attempting to make it a "bolt-on" piece.
3) My radiator will be mounted 30 degrees up from horizontal. I would have preferred to get more angle for the "ram-air" effect, but with a radiator this large, I am not expecting too many issues to cool a 4-cylinder. I am also assuming this is the reason why the fans are biased upwards on the radiator, where it's less likely for driving air to be pushed through.
4) I don't have a picture right now, but I ended up cutting out a 4.5-5 inch tall rectangle in between the seams where both inner fender skins join the front of the car.
I am attaching a screenshot from a video I took to show roughly what I am doing. I am using the red 3D printed brackets to secure the top of the radiator to the top of the fuel cell. I cut too big of a hole in the front so I will be bending the sheet metal back and stitching it up a bit after the radiator and ducting is mounted.
Not sure if you use Instagram at all, but I usually post the work I do there @peetsadrives
