Stocks Look to Nudge Higher; Oil Dips  NEW YORK (Reuters) - U.S. stocks looked to open a touch  higher  on Tuesday, with Wall Street welcoming a slip in oil  prices and a report of a possible \$24 billion takeover of  cardiovascular device maker Guidant Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GDT.N target=/stocks/quickinfo/fullquote"&gt;GDT.N&lt;/A&gt; by Johnson    Johnson &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=JNJ.N target=/stocks/quickinfo/fullquote"&gt;JNJ.N&lt;/A&gt;.