David Vizard is great, but most of his testing is from the A series BMC engine. The 5 port design on that probably doesn't flow over to the volvo heads much I would guess.
He also does a book on the Ford Pinto (2l OHC). That might be more relevant even if it is crossflow.
Waaaaaaaay back I did some work on the carbs on my B16B according to a book you could get then from CCC mag. One of the mods was radiusing the front/intake side of the piston to smooth the flow. Seems reasonable but there might equally be logic against it. I've not seen this mod mentioned anywhere other than in this book. Car ran very well but I don't know if it actually made any difference.
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