You put the transmission in from the top? With a picker?
Wild
Forget the factory trans crossmember you are going to have to modify it and the trans mount once the engine is set
If you are not running a body lift you are going to want to fold over the lip and the firewall to floor pan connections that lip gets in the way of your 1/2 ton 5 speed and exhaust
The shifter hole varies a great deal even similar model 5 speed trans the hole can move forward or back depending on year, tailhousing, engine and placement so nobody really could have prepped you for that
Most people who go this route use the serpentine belt setup and front dress/‘accessories because you will have more room for radiator. The way you have it now your radiator
May need to be tucked into the core support (chop cut weld) especially if you plan a mechanical fan. E fans can be hard to get to properly cool a v8 gen I