Custom ground camshaft, low power

Oil in the radiator isnt a big deal if it's just a sheen of it. Bad amounts of oil in the coolant will cause the coolant to change colors and foam. In a fresh engine or replacend parts I'd expect to see some oil in there. If it's big floating droplets, even that's not a huge deal unless it is an ever increasing amount. Liquid water out of the the exhaust is all condensation unless it's accompanied by steam. Lots of steam. Like can't see the neighbor's house and wont stop steam. Liquid water out the tailpipe when the engine is warming up, or in a car that isnt driven. Not a problem.