Thanks for your reply, and my apology of missing what this OD transmission is replacing.
Currently running a 429 with a C6.
What I am asking is related to spacing, as I am aware that the e4OD is longer and larger than the C6. And i will not tamper with the transmission and tunnel or floor pan.
I am not concerned about the alternator and power steering pump, as there is plenty at idle.
further I have swapped the cooling fan with an electric unit.