Thanks everyone. My thinking was these forged cranks are 50 plus years old with unknown prior use. It will be leaned on from time to time at the track. Did not want the possibility of metal fatigue in a high stressed part to be a weak link.
I have been flogging my 600+ hp 440 with a stock steel crank since the 90's
If looking to spend money, quality rods and lighter pistons is where I'd plunk down money though the stock rods once prepped with good bolts are very stout. Mine have seen a few trips to 7000 rpm
