#1. Spring on backwards!
Your pics show it’s correct.
It doesn’t belong on the front if that’s where he put it. You’ll wear out the throttle bushing faster with spring in the front.
Timing is a bit high. 14 would be better. You might have a little detonation that you won’t recognize and break a ring land or hole a piston.
Choke stove parts found here.
https://quadrajetparts.com/