need some help for a newbie.

yea, the guy says that he took the engine apart himself, and i specifically asked if it was a peiced together engine and he said NO. it is a late 69 engine, so would it be a steel or cast crant? which one is better?
one last thing. i read the link(thank you) and it does not say the length of the tailshaft. does anyone know the length of a abody tailshaft off-hand? appreciate all the help guys