GT-6 engine conversion

["Peter Mchugh" <PMCHUGH@mail.hq.faa.gov>]

     I am rebuilding from rust a '69 GT + and tho want to retain
     as original am considering installation of TR-6 engine vice
     the GT-6 Mark I engine I currently have.  I would like to 
     keep the Mark I overdrive transmission which raises the
     following question(s):
     
     Q:  Will the 2.5 liter TR-6 engine bolt up to the Mark I 
         overdrive transmission?  If not, what changes are necessary?
     
     Q:  What, if any other changes to the TR-6 engine may be needed
         to fit the GT-6+ chassis/engine compartment?
     
     Appreciate any response....
     
     Cheers!
     
     Pete McHugh
     
     73 TR-6
     69 GT-6+ (x2)