Help! 85 swb 454 swap?

[Mr69]

Ok guys first off I’m not good at typing. I bought the truck with a 350 crate had a heavy cam so the previous owner took the top part of the engine apart so I started planning a LS swap so I pick up a running and driving 04 Tahoe with a 5.3 so I done a lot of research so I dived in took the front clip and engine and transmission out a few weeks ago well the plan completely derailed when a 91 3/4 ton suburban with a 454 in it with 101k this truck is in great shape other than not having reverse is this a easier swap? Since they are both Squarebodys


What do I have to alter?

I never done a project like this I know that everything on the suburban would swap over

My question is electrical and fuel since 85 is manual and 91 is electrical and in the tank

Please help?