exhaust

[scottybaccus]

You have no idea how well your radiator is working if you have no thermostat. Part of it's job is to make sure coolant stays in the core long enough to cool down. Taking it out is a mistake.
Have you checked your timing? And I don't care what you think it is, if you haven't verified TDC on your pointer, and applied a timing tape or used a dial-back light, you can't be sure. Whatever it is, back it down 5-10 degrees and see how it affects your temps.
There is something wrong when you can't get the OE parts to run cool. 2.25" pipes, quiet mufflers, catalytic converters, clutch fans and skinny radiators worked fine when it was new, and shouldn't be an issue, unless you doubled horsepower.