Issues with a rebuilt 360

I have a 360 I just rebuilt with a 292 cam .508 lift, 3800 stall converter, reverse manual valve body, 4.10 gears, msd ignition and distributor and I replaced piston rings, both head gaskets, Lifters, pushrods, Etc and the car was running good even broke in the cam by having it sit at 2500 rpms and yesterday I turn it on and try to bleed my new radiator and all of a sudden the idle goes up to 1500 and I start getting smoke from the passenger side which I’m not sure if it’s anti freeze or oil I spilled from the day before just burning off on the headers
It also looks like the headers was starting to burn my spark plug wires a bit any help I can get with this would be very much appreciated