Hmm, thats interesting about the dowelling. I ran a dowelled 13B for a couple of years as a daily driver with no problems at all, running around 350 rwhp with a bit more when I raced it. Same with a mate, who got it done around the same time. In fact I think his engine is still getting around somewhere and this is like 4-5 years later.
And my bro's currently running one thats around 430 rwhp, but it hasn't done many kays yet. I hope it doesn't run into any cracking problems.