You're building a 292, right?

1) O-ringing is done to prevent blown head gaskets in engines that have 12:1 compression, burn alcohol or NO2, or are supercharged. Worry about o-ringing a block when you build a Chrysler 426 Max-Wedge that burns a combination of nitromethane and moonshine.

2)Us 235 guys have to re-use headbolts all the time, as new head or main bearing bolts are made of unobtanium. You're prolly OK as long as your old ones aren't pitted or rusted.

3) Take the shortblock back to where you bought it and insist that they make it right. God knows what else the moron on duty got wrong. Prolly while drinking fuel for answer #1. Pickup tube funnyness is a popular cause of crank failure.

4) Get a good 1/2" drive "clicker" style torquewrench from NAPA. The inch/lbs won't go high enough for engine building.

Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes