god i dont think ive seen so many misconceptions about LT1's and 99+ GT's in one post. "274rwhp" "LT1's suck down low" "SS's cant launch" "you should rape him"
SS's can launch like bats outa hell... LT1's kick ass down low... and they have maybe 280hp CRANK, which puts you 240-255rwhp depending on the tranny....and no, your 99+ GT shouldnt rape him, its actually a really close race.
believe me, i have a lot of experience battling LT1 camaro's, one in particular. we always go mod for mod, i get my exhaust, he goes and gets exhaust, i do a port and polish on my intake plenum, he puts on a throttle body. we've traded wins for a while now, im still on top, but not by much. and if anyone says its "the driver", youve got another thing coming to you.
as for beating this guy, lose any weight you can afford to drop, practically. spare tire, jack, misc. crap in the back seat and trunk. roll out to the races on just below a half tank of gas, and run 87, NOT 91. with 9.4-1 compression, unless your spraying or boosting, 91 is a big big mistake, you will make more power on 87, every time. other than all that, powershift and keep your windows up... but seriously, start doing some real mods if you want to beat LT1's all day. good luck man.