I'm confused. I removed the rocker arms and pushrods from the driver side
cylinder head in my '94 Chevy S10 to take the head off, this due to lots of
white smoke coming from the exhaust.

After realizing I didn't have all the tools I needed and it would take too
long, I put everything back together.

Not recognizing exactly what the rocker assembly looked like before removal,
I still put the pushrods, rocker arms with washer and bolt back the only way
they could go.

However, I may have overtighten them.  According to Alldata, the rocker arm
bolt should be tightened to 20 ft lbs of torque.  I only have an inch lbs
torque wrench so I tightened the bolts to the equivalent 240 inch lbs (20 X
12).

Each rocker arm not only made contact with the spring, but getting all the
way to 20 lbs ft required the spring to be compressed quite a bit by the
rocker before the torque wrench clicked.  There appears to be uniformity
among all the components as to how much they were compressed.

The truck won't start, but it does crank, with a "new" sound coming from the
engine.  Perhaps I overtightened the bolts, I thought 20 ft lbs would be 1/4
to 1/2 turn after I could no longer hand turn the bolts, but the torque
wrench took forever to click.  Is there possible damage as the result,
especially after cranking the engine?

Sorry for the long post, regards.