My builder ended up measuring out the stroke and bore of the built motor after re-assembly and it came out to 86mm stroke and 96mm bore - 3735cc (3.7L). So all ended well.
For those interested it looks to of just been a VQ37 crank directly swapped in with Eagle VQ37 rods and custom CP pistons. The stroker kit only cost me the basic rod/piston cost so was extremely cheap. Not a bad little trick for lesser motor guys who have a VQ35HR but also possibly not looking to buy into a BC stroker kit or something of the like as those get very expensive in comparison. Not the biggest jump, but I'll take .2L than not
Hopefully have some power results in the next couple months as the rest of the car comes back together that I'll post in the VQ35HR forum.