Quote from EquityGuy4321:
Trading bonds against stocks on a "fundamental basis" is probably best done longer-term (think weeks or months) through some type of regression modeling. This wouldn't be rv trading, per se, but rather more econometric modeling. Short-term (days or less) I would look at purely statistical relationships (momentum or mean-reversion strategies).
There is a poster named Bone who seems to be in touch with spread trading (which is what you are trying to do), so I would look up his posts.