Hey guys, feel like I've been beating my head against a wall here so I thought I'd ask for some advise. I have a 27 roadster with a 468 big block chevy in it. My friend started to build the car over 20 years ago and I just recently talked him out of it and finished it up. He built the engine, all factory GM parts except the mag, runs a holley 4 barrel that's plenty rich. Ill start at the front. It has a walker 4 core model t radiator, new flexolite electric fan with shroud spinning in the correct direction. New (supposedly high flow water pump) with bypass hose connected to manifold. 160 thermostat with 1/8 hole drilled, but am going to change to a 180 sometime today. I've tried retarding the timing, tried advancing the timing, doesn't seem to help much either. I can drive it down the road for awhile but eventually it just gets hotter and hotter. Doesn't seem to cool down at an idle either. This is my first big block, am I missing something here?? Any suggestions would be greatly helpful at this point. Thanks guys!