1996 suburban engine + transmission question

hi everybody!!

usually i ask my question in the car modelling section but for this task i need YOUR knowledge.

i'm working on a resin kit of a suburban 1996 but every engine and tranmission avaible are not correct. so i will made one from scratch. unfortunotly I don't have acces to one for the dimension of the block and transmission.

I found some good information for the 4L80E transmission pan cover. the length of it but that's it that's alll what I found.

if someone can help by syppling picture with some dimension or a web site where i can find all the info it will be VERY appreciate.

I forgot to tell you I made the 454 ci with 4L80E transmission and also the 350 ci with an 4L60E transmission... I need both dimensions.

yours