At 1200 degrees you are just about there. I would stop there and keep a little margine of safety. Have you done any pump timing increases? Has the exhaust been opened up? At the weight you are talking about, mine gets to about 950 degrees after the turbo which would be about 1100 degrees pre turbo. I have a 16 housing, yours will run a little higher with the 14.
BTW - need to move this to the first gen forum.