Ok I found where the Aussie guy told me.
He DID use the SPD flanges for GM Fastburn heads.
http://www.spdexhaust.com/pdfs/HeadFlanges/SBC_OEM.pdf
C83532
He said that he still had to slot the bolt holes (because Profiler was dumb and didn't center the bolt holes on the port.)
If you could figure out how much the port has been raised, you MIGHT be able to ask them to build that gasket with the hole move DOWN on the header the same amount to compensate. (Or possibly they'd let you take a rubbing of the heads and mail that to them and have them position the hole to match the heads.) ---That's assuming they'd be willing to adjust the CNC programming for the bolt holes just for you buying a single flange...
I know you're excited about the Profilers and I don't want you to spin on more things to think about, BUT... It was hard to get the intake pushrod off of the intake port wall with a "regular" one-piece guideplate and still have all the rockers pointed straight at the valve tips and that was with the 195cc profilers. If the increase in the 210cc profiler's intake ports come from additional width, that challenge might get bigger. Definitely check to make sure no pushrods are rubbing. I used a dremel and a dremel sandpaper flapper to add more clearance there but the walls can be thin.
The alternative becomes split guide plates or offset rockers, and then split guide plates officially require welding. (One company makes a weld-free split guideplate but $$$ from what I remember.)
Profiler PROBABLY sets them up correctly so they won't rub. (I bought mine rebranded through Jegs and Jegs installed their own hardware and set them up themselves, Jegs was NOT super careful. Profiler-assembled heads would probably be better.)
Adam