Why?

I can only say why I would do it. And if I ever did go through that swap it would keep the efi.

Main reason is performance,reliability,drivability and economy.

Look at the cars those motors come in. Awesome drivability because of the efi. They get what mid 20's when it comes to mpg and at well over 4000 pounds they can turn low 13's pretty easily with a coue little things like a cai and cat back exhause. Best of all worlds man.

Problem is it isn't a cheap swap. Then if you want to add od your looking at a lot more money.

Now a ls motor us where it's at. Probably do it for half the price including the od trans and you have a ton more aftermarket support.