Upgrades/fixes to go along with Weber swap

Got the weber swap done and car is running. Been driving it for a couple days and it is much quicker in the lower end and a hell of a lot louder idles good and runs smooth other than a sort of "flat spot" when giving it more throttle, almost as if its shorted on fuel or air? I also think the timing could use some adjusting but I can't advance the disty anymore because of a port and hose coming out of the intake manifold, into the block. (This is an EA81 motor with a weber on a EA82 intake manifold). But thinking I can remove and block that hose to get the timing dialed.

So my question to the board is; what would you do to this setup to give it just that much more power/response/smoothness? Cap and rotor? Coil? Btw it's a 1982 GL 4x4. Thank you!