360 magnum. 1 piston lower in cylinder??

Sure..... ring seal may, or may not, be great though. Stroker pistons are vertically short, and tend to need to be snugly clearanced to the bores, in order to not rock a lot. If they rock a lot, then the ring seal gets worse/bad/poor. If this idea comes to pass, then I'd suggest measuring the bores carefully and accurately first, and then present the data for further discussion.

BTW, if you had another rod, then you might be able to save some $$ by buying the stroker crank and pistons, and having them balanced locally. Depending on how hard you intend to push this, a cast stroker crank may be just fine. Just a thought....

One other thing, with the displacement of the stroker, the shorter Magnum block, and those small chambered heads and thin head gaskets, you need to compute the static compression ratio (SCR), and then at the cam you want for your intended use, and then examine dynamic compression ratio (DCR). If a smaller cam is appropriate (for street cruising for example), then the DCR could end up too high and the engine would be prone to detonation. Those matters can all be helped with on this forum. It can all be fixed, but you need to know where this will end up before blowing the $$.

BTW, what is your intended use for this engine? OK, I see... street engine..... but 'Street' means different thing to different people. Is this more for cruising, or some drag racing, straight lines only, or spirited driving around curves, or what? (You have a lot of older curvey roads in your area, so I might guess something akin to road racing, but that is too much of an assumption to make on my part.) Gears? Trans type? Car model? etc.