Are there any changes with a 77 & 79 425 engine and transmission?

[guyrobert]

I have a dilemma, the 425 in my 79 Phaeton is done and I have obtained and rebuilt a 1970 472.
The project is stalled at my garage because of an injury and a backlog of work.
A fully rebuilt 1977 425 and trans with everything has come up locally for the price of rebuilding my current trans which would need it with the new 472. I am thinking that I could save the 472 for another Coupe Deville project and have a quick drop in with a replacement rebuilt 77. Are there any differences between the years or is it plug and play?
Thanks in advance
Robert
https://images.craigslist.org/00S0S_kzyG9el3e0R_600x450.jpg

["Cadillac Kid" Greg Surfas 15364]

Robert
With the possible exception of wiring connections the 77 combo will fit without mods.
Greg surfas

[guyrobert]

Thanks I thought it would, just wanted to be sure before I change plans again...
For the price of rebuilding my current trans it seems like too good a deal to pass up.
The budget on this build is currently at triple the initial purchase price, but that's life with old Caddys!