Yer wise, Wizeman. No need to pay for machine work on a used crank when new ones are so readily available. And as Chuck Senatore says, "Build the biggest shortblock you can afford."
We are living in a golden age where everything we wished for in 1975 (in terms of engines and transmissions) is available for much less than the only equivalent parts cost then.
Example: In my hometown in 1975 the local serious hot rodder built a 427 with Carillo rods and aluminum heads. The rods cost $500 and the heads cost something like $1500. In 1975 a new car cost around $5000. Now a new car costs $25000.
So if the prices were converted on the same scale a complete set of aluminum heads would cost $7500 and a set of aftermarket forged rods would cost $2500. Also, in 1975 there were no aftermarket hard parts for Mopars. None. I guess Arias or Venolia would make you a set of pistons but that was about it.
Enjoy it while it lasts!

R.