I'm pretty much with Brent on this one. For a mild street build, with mild lifts, I don't think you'd need either. Except for having to upgrade to some Crane locking adjusters, I ran a totally stock system for 23 years on my Highboy's 390. Ran and used hard all its life and 5500 rpm was no stranger, that's for sure.
![](http://i43.photobucket.com/albums/e363/cjshaker/68%20Truck/IMAG1401.jpg)
But now I'd likely go with some heavy shafts. After that long, the stock shafts have to be getting a bit weak, so no sense in pushing it. I just recently got a 445 stroker kit from Blair for the same engine, bought some heavy shafts from Summit, and the rest of the system will be going right back together. I expect another 20+ years of service, provided I live that long.
![Cool 8)](http://fepower.net/simplemachinesforum/Smileys/default/cool.gif)
Edit: I saw your lift is nearing .600. Mine was only .550. I'd probably consider the end stands with stock or heavy shafts at that lift and pressure.