Okay everyone I am new to the club and I am in dire need of some help, I just rebuilt a 350 small block. I took apart my old block and reused the crank, rods, pistons, and heads (TBI heads) other than that everything is new. 1st thing I did was sent the new block to the machine shop to have it hot tanked, cleaned and inspected after I got the a okay from the machine shop I started the rebuild. The block is a 1973 350 bored 30 over. I installed new valve seals in the heads ground and ground the valves. Installed a new camshaft and bearings making sure the get the order correct and I clocked #1 at the 5 and 7 o'clock position and the other four at the four o'clock position from the top of the block. Installed a new Comp Cams camshaft part number 12-239-3, and new lifters. I plastiguaged the main and rod bearings as the old ones showed they were .020, everything checked out and I began the final install on them making sure to torque everything correctly according to the manual. Installed a new high volume oil pump new rings (making sure to separate the ring gaps. Installed a new water pump, thermostat and sent the radiator out for cleaning and some minor repairs. After getting everything together and double checking all the bolts and seals filled the engine with 10w-30 motor oil, cam break in oil and a new Hastings oil filter. Now on initial start up fixed a couple of small coolant leaks topped off coolant. The engine has extremely low oil pressure only 20 psi at 2000 rpms, around 5 at idle, and overheats immediately after start up temp just climbs until I shut it off thermostat is only a 180 degrees. Any and all help would be greatly appreciated this is not my first rebuild it is however my first one with this kind of trouble. Also I pulled the valve covers off and checked for oil flow I get good flow through about half of push rods but some are not oiling at all the only noise I am getting from the motor is a small amount of lifter tapping.