I want to install this M-20 muncie 4 speed with my new crate engine.....will the original 3speed/6 cylinder  bell housing work with my new 350??  

Will the original cross member and trans mount work ok or will I have to change out the original cross member??  

If anyone has such a set up I would appreciate some insite and a couple of bellie pictures.....thanks  

I did this swap on my '83 C10.  It had a 3 speed manual tranny and 6 banger.  The Muncie is the same length as the 3 speed, the output shaft had the same splines, and I reused the flywheel, clutch ( new disc ) and pressure plate and bellhousing,on a rebuilt 350...had no problems with cross member or clutch linkage either, it all just went in.