440 will not fit in duster ? ?? need help assap doing motor now !!!

Im in the same boat with a 451 stroker. The TTI headers dont fit,they hit everything! I have to shim the motor on the drivers side to get the motor to sit level,the weakist side,Nice shuFacker. And a hole list of other imperfections I have to deal with. I should of gone with a built small block. Anybody want to trade? Im gettin sick of it.. I want to drive mine Not wrench on it every spare second I have, witch isnt alot