Hidee Ho Shaggy,
Long, long ago in a Land far away, a wounded 1969 327 smallblock rebuilt by my FIL, was losing coolant, powering a 1970 Chevy C10 down the road. This was unacceptable on a 90 mile daily commute. Take a quick look into the radiator with the engine running, at operating temperature, radiator cap off. Check for exhaust entering the coolant. It will be readily apparent. Have a friend apply throttle, engine in park, parking brake on, safety first. Look for tiny bubbles! If you see them increase when the motor revs up, hate to say, but the heads probably should come off that motor. Mine were still fine, but don't let that motor overheat.
Yes you can reuse intake bolts. Clean all inspect threads well, pay special attention to the proper gasket installation, torque, and don't misalign the intake valley gasket putting the intake on. That Sucks...
Just use proper attention to detail upon reassembly, and you'll be fine, (FIL Leonard at Precision Engine...)
Lucky for me, since I knew who rebuilt mine, I brought it up on occasion! The fun part upon reassembly on a Chevy smallblock is hydraulic valve lash adjustment!
Chevy Tip: Take an old pair of steel valve covers, and cut the tops off, bolt them on first, way less smoke that way.
Good Wrenching!