Yes there are plenty of strokers out there running ported J heads with good results. But money aside closed chamber
RHS heads are better because they have quench and flow a lot more then J heads when comparing unported to unported heads; in short a better starting point. Quench reduces detonation plus it would raise compression and the original poster could use a little more compression.
Here is an article that shows what the factory heads can do:
http://www.hughesengines.com/TechArticles/10408416strokerdynotestingsept2002.php