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OK I guess my question now is how bad would it be for me to just drive it as-is? I live in Chicago and the car is driven several times a week ... I don't want to put much money into it and am worried if I take it to someone to get welded they'll just end up warping it...



Welding it is NOT going to warp it , you have to seal the crack or you are going to have an exhaust leak and if you have to pass some sort of safety inspection you will fail it more than likely .

If it's going on a daily driver that does not have either a manual or electric choke you need the crossover open , but since the DP4B does not have a provision for the thermostatic choke having the crossover open will help with warm up ...