Could I use a 1993 block with the heads off a 2001 and put it in a 2001? What would I need to change to swap a 1993 3.0 into my 2001 3.0? Thank you again for your help

 

The 1986 to 2008 3.0l Vulcan heads are interchangeable as a PAIR, to any 1986 to 2008 3.0l Vulcan Block

So yes, as a PAIR you can swap the heads

And as a long block swap(block and heads), yes as well

You will need to swap your upper and lower intakes to the replacement engine, so wiring and fuel system matches up
Also swap the front engine cover, timing chain cover, and crank pulley, to get the crank sensor hook up
Remove distributor from 1993 and swap in your Cam synchronizer(needs to be timed)

I would redo oil pan gasket and maybe a new oil pump
And always replace rear main seal on any engine when you can, i.e. engine out or transmission off

And give all the core plugs(freeze plugs) a good look, easy and cheap to replace with engine out, very hard to replace with engine in place