I found a version of the GSV190 that may work, so I ordered a GSV190 and a GXV160 from Northern Tool today. I’ll see which one is easier to install and send back the other. I hit all of the online parts houses to figure out crank pulley and key, and the blade hub. Found Snapper models that use a variety of crank dimensions. Hopefully the engine brake cable and the throttle are fairly standard. Looks like both engines will require the spacer ring, the GX for clearance and the GS due to longer crank shaft to raise the blade a few mm. I’ll see how it goes. Really like the Snapper Chassis and Rear drive system.
Edit: Changed first sentence for clarity and accuracy, as I mistyped before.