Craig,
I was doing that last year, I never had an issue in stock but you are a little slower in stock so not as much impact force. I'll be building a stock car like that soon.
You might want to try 5 deg reactive, .022" springs with full castor to start out. Then if you want to make it turn in harder try .020" springs and or 10 deg reactive. i have been using angled servo mounts to reduce bump steer. Remember though, the new front end is a little heavier.
Chris.