Just because gas was leaking past the exhaust gaskets does not mean they are bad, I would get it running first and see if exhaust shoots past the junctions, then I would worry about new gaskets. For the carbs, pull each one, remove the needle and seat and check for pitting or a wear ring around the tips, if it can be polished with some steel wool, you may be able to reuse them for now, if it has a ridge you can feel, time to get new needle and seats. To adjust your float level, hold the carb upside down, and with a short hose hooked up to the fuel inlet, blow into it as you lightly push down on the float arm. At level or just before the arms are level, you should feel it shut off your breath tightly. Remember, we can only put out about 5 psi with our breath, a needle and seat needs to be good past that, so this is not an iron clad guarantee they seal good against fuel pressure, this just tells you your floats are in adjustment. Then check your choke plungers, with the choke off, you should have some play in the end by the carb, this shows the spring is fully extended and sealing the plunger in the hole.
There are tons of online information, google " 1994 Polaris xlt carb settings" and it should give you lots of info, probably even some Youtube videos of people rebuilding/adjusting their carbs.
2000 Indy 500 XC, Fox shocks up front, M10 trail in back. '99 440 XCR for my son. 96 XCR 600 SP tripple pipe, 862 miles on it !! (until it snows....then look out, odometer !!)