which stroker to build?

I think the $1800 is cheap for what you're selling - but in this market you'll certainly sell it.

As far as the new package - I'd sonic the 340s first - use the best of them and if they fail - then test the 360s. I'd grab .040 of bore in a heartbeat when it's a race engine. As for heads - I've always liked the RPMs but for your expectations they'd be maxed out. I'd rather use a set of 360-1 ovals. They'll need the ususal fix-up work (Indy sucks) but they'll move the air you need with a basic hand porting, blending and good valve job. They also leave a lot of expansion room should you decide you want to go faster. A 408, 416, 422, or larger with a solid roller cam will have no trouble making the power you need with that top end and leave you room to grow.
Personally - I stay away from the Air Wolf stuff until they get thier sh_t together. "cause with the few thigns i've seen they are too far in front of reality. No sense in being thier R&D after waiting for them to arrive... Just my opinion of course.