Input Shaft Alloy Advice

I am mating a 1988 Lola Hewland Indycar gearbox to a stout Chevrolet V8 engine. Since I need to have a custom input shaft made, I have the opportunity to choose which alloy to use (4340 or 300M) for construction of the input shaft. Which alloy is preferable for this project, and why?

Thanks,
Jack
 
From my research into materials for the transaxle 300m is the better choice due to the more critical control over its initial manufacture ( vacuum de-gas etc). If you only need one piece Mark Williams occasionally offers short lengths, offcuts from bar ends on ebay, might be worth a look, might be reason they don't use end of bar though!
 
Thanks for the advice. Thus far, Mark Williams's quote for constructing the input shaft in 300M has been the most reasonable.
 
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