On a geriatric engine type (albeit a very fine type!) I'd be inclined to trust the guy with decades of field experience, and look with some skepticism at the johnny-come-lately publications of a company which hasn't built one in a half-century. Consider for a moment that most of the product support people at P&WC
were not yet born when the last Wasp Junior was shipped.
That said, if someone were to prove me wrong, I would gladly recant and express pleasant surprise!