I've seen plenty of them run.....a lot of dyno pulls on them. I've seen the 28-32 thing be pretty accurate, and I've seen it not be. I have seen on a 3.48 stroke engine(my own) with quite a bit of testing, where 36° wouldn't be that abnormal.
You also mentioned in a previous post, about these heads requiring less timing below peak torque for best power. I've seen a little bit of that, but not anymore than other things without these heads.
Quite a few things I've messed with have liked a little less timing at and around peak torque, the Bv and fastburn heads are not special in that way. And the difference of a few degrees in that area on milder NA stuff, hasn't been substantial in any way on what I've played with.....smaller single digit gains if anything. In my opinion the the small port Bv would be better suited for the OP's application.