ok so the main problem is the output spline on my 727 mated to the 208 is a 23? spline and the 205 on the getrag is a 29 spline....
If the bolt battern is good can i machine a female to female from the 727's 23 spline to the 205's 29 spline?
Oh wow, hmm. I do not know. I am sure the guys who build doubler adapters can whip something up, probably at significant cost, but you can ask. Yes the bolt pattern is a go.
I am reluctant to split the 205 from the getrag unless i know the 205 will bolt up to the 727...
OR could the 727 be rebuilt with the correct output shaft for the diesel 205 tc?
No. Even "diesel" 727s or even later trans, continued to have 23 spline. Generally speaking, if it is an automatic, it's 23 spline. If it is a manual gasser, it is also 23 spline. Manual diesel gets it's own special t case. I think the v10 is the sole gasser exception here and may follow the rules of diesel as far as auto vs manual t case.
The high-tech solution....
Sell the getrag and find a later nv4500 5 speed from a diesel.
This will have the 29 spline output and should bolt right up. It is ALSO adaptable to your 440. Lakewood sells the adapter bellhousing. Available through jegs. The input would probably need to be swapped to use a gasser clutch/pressure plate. I am not completely up to date on the 4500 swap and I'm sure there are several small hitches along the way.