I agree Summit is an excellent resource for this and many reasons, but if we abuse their liberal return policy, it WILL end; the bean counters will see to that. Most vendors have changed their return policies lately, can't see how Summit won't if it costs them too much $ in the long run
As far as *trying* a new carb, unless you spend the time and $ to tune it to your engine/needs, it might very well be a useless exercise - let's hope it comes out of the box ready to run as is. How often has that worked for you? Me, not so much...
Fieroboy, it seems you have a narrow issue, your fuel curve; tune your carb and go have fun - I guarantee you, it won't be the last issue you'll have with a unique build, but have fun in the process

I saw last night on fb about John. The world sure lost a great one. I'm going to miss his humor, advice, and perspective from another portion of the world. Rest in Peace Johnboy.
John Norton aka johnboy