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welcome to cosworth
don't worry, it could also be the inner tca bushes, the actual crossmember that has shifted, a wieght missing from the driveshaft
no one has mentioned checked the front prop for play, do that as well otherwise you may be needing new ankles

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The wobble is more through the steering wheel than the floor pan, until you do about 60/70 then less so through the steering wheel and more through the chassis.
I just hope this Cosworth isn't as much of a money pit as the one in this photo was. God I despised that car so much lol