Ain't never going to happen. Using Gen 2 parts on a gen 1 is simply not practical to do. Everything is on a larger scale. Here's the requested information.
70 mm between side walls plus the bore centers gives you 160mm bore spacing (which is what we always called it - not pitch).
Pictures include the measurement of the wall to wall (obviously not perfect to measure this way but plenty close to give you the idea). Copper gasket is 87mm (vs 90mm of the stock gen 2 bore). Other gasket is stock Vmax 76mm bore. Even shifted to the side the copper 87mm gasket shows just how far out it is from being able to work.
Keep in mind that the largest you can bore the stock gen 1 without head alteration is 83mm. After that it can be used but performance starts to suffer since the piston becomes heavily shrouded.