Where have all the Magnum parts gone?

Ford small blocks and Chevy small blocks (not LS please don't start on those, I want nothing to do with them)! haven't been built in even longer yet stuff is still a dime a dozen for them...
Something that's always pissed me off.... As in how many people don't even acknowledge Mopar exists
So you wont help with my Challenger vert with an LS and 4L60e plan.
Maybe DTM can......