Hi there, and Welcome. As of right now I am not sure of anywhere where you can get a complete kit, other then e-bay, which may be sketchy (just because i don't trust most of the non large names for quality) I do know that both Summit and eagle make a stroker cam, and you can easily find a set of connecting rods to fit as well.
depending on what you are looking for as in you want a new crank, rods, piston heads, the whole thing, you can likely find them linked together on their websites. I saw this website and checked out the parts at Summit and they seem to check out. they of course are redoing the whole engine, but the crank, rods and piston heads you could likely use.
Strokers Wild: Part 1
hope this may help you,