LD340 Can’t Get The Carb Base To Seal

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Not picking on you but; I'm not a fan of driverside PCV hoses, for what should be an obvious reason; and I always run dual throttle return springs, one inside the other. Also, secondary wires should be separated by more than 1/4 inch,(more is better) to prevent induction firing in adjacent cylinders. and your throttle cable bracket should really be higher up off the manifold, pulling in a straight line. The way yours is, it will eventually wear out the throttle shaft bushing.
Take a good look at your zip-tie fuel-line clamps; I have not seen any that clamp 360*. There is always a section by the zipper that bulges out or is not properly clamped. I'm not a fan of those in this application. But gear-clamps are just as bad, maybe worse; you always need two of them rotated 180*; safety first.

EDIT
It's been pointed out
that the clamps on the fuel line are the factory spring type. I don't know how my eyes messed that up, even on triple checking. Sorry I screwed up on that but like I said; not picking on you.