I have had a hard time sourcing silver solder around my neck of the woods. The closest I could find was the plumbing grade stuff that has barely any silver in it. So anytime I’ve been suggested to silver solder anything, I find other means. Of course this doesn’t mean it cannot be found, but the cost of it for me is prohibitive. Parts engines are easily obtained on the forums or eBay for pennies on the dollar, so I will often suggest that route first. I’ll bet parts for a Thunder Tiger or OS carb will fit with little or no modification. But I say do what works with what you have available.