Downsize my flat 8 to flat 6

Hello all I just bought a H series straight 6 and want to swap it on my 49 coupe,I have a flathead v8 on it right now but the engine is toasted can't afford to rebuild it ,as for the flat 6 are the motor mounts similar and is it a straight bolt in with my 3 speed column shifter, also can I interchange parts off a G series flathead 41-47
Thanks
 
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