New carb for Tri Z

[Tri-Z 490]

I want to get a new carb for my Tri-Z. I want a Flatslide or something for a race motor I am planning on building. What kind of carb is good and will fit. Some guy had an alcohol race carb for a tecate but It won't fit onto the intake manifold. What carb will fit and have better performance? Does anyone have one they want to sell?

[YTZ250N]

I stuffed a TMX38 into my intake boot. It fit but took some persuasion. All you really need is a 36mm though and I know that will fit. A 38mm is overkill I just got a deal on mine.