The best option is to use the aftermarket 5" Pinto 2.0 rods which came with the 0.9112" wrist pin, or the stock 2.0 Pinto items which were used with the 0.945" wrist pin. Bore the main bearings to suit the 2.047" crank pin they use.
The smaller Pinto rod pins can be ground out to 0.927" size, or the larger pins bushed to suit the smaller Chevy piston pin.
Only bad thing is that you have to bore 56 thou over. On an old engine, there is a small risk in doing that.
The other options is to long run weld the crank to create a correct rod spacing. If you machine the sides adjacent the rod journal, you will use the added metal as a side support. Then you can run the 302 rod on the thicker six cylinder rod journal. Make sure you don't muck with the fillet radius, or the crank will fatigue crack.
The ACL pistons ride in at 3.68 to 3.74" diameter at an 1.163" tall compression height. They are very strong for non forged items, and have been used on Turbo 250 Falcons in Australia with excellent sucess, as they duplicates of the 2003 XR6 Turbo piston, but are 48 thou bigger and of much better construction. With the right mods, a set of 302 pistons give
7.808"
x______
x|>>>>..|
x|__O__|1.163"
x>>|.|
x>>|.|
x>>|.|
x>>|.|
x>.|O|5.09"
x>..|.|
x>..|.|
x>.|O|1.563"
Crank throw in a 7.808 block is 3.126/2, and this gives enough room for a perfect 0.008" (8 thou) postive deck. With a big 38 to 79 thou thick gasket, it would be okay.