So you are a 'dude in Dallas who wants an engine.'

That is a vague post if I've ever seen one!

I would pick up a FSM, as a starting point. After you decide which engine it is you want, of course.

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E