I'm just a little spooky about allowing any clearance between the bearing shells. Yes, the dowels might keep the bearings from spinning, but with clearance at the parting line, nothing is going to hold the bearing shell firmly against the bore in the block and cap. That will interfere with heat transfer and possibly oil clearance. Then again, I might just be a picky old man! After 50+ years of tinkering with the innards of engines, I don't leave anything to chance.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!