so i'm rebuilding my original 1970 340

THANKS BUT SCAT and eagle are a no go AS for pistons Mahle are the lightest i could find so far as for gears 3.55 with my gear vendor O/D is where it will stay got 22mpg with the 340 engine that was stolen . Having a hard time trying to find a super light crank that does not have China in it's DNA .
And RRR does not need to be factory parts as long as nothing is made in China , Rather pay more for parts made in the USA

Mopar Performance actually sold sets of the 273 rods completely reworked with good rod bolts right in the MP book years ago. When worked and good rod bolts installed, they are both strong and light. Needless to say, we don't have to argue about how strong the factory steel cranks were.