Am I out of my league???

[Dark_5.0]

Ok, here is the situation this guy i know, well actually he is my brother. He has a 81' camaro with a 406 sb turbo 400 tranny 3.73 gears, headers cam intake 750 carb he has been runnin a 14.39 @94mph. This weekend he is putting on some world products sportsman 2 heads so i dont know how fast his car will be after that. Anyways he is always talking crap about my car saying things such as 5.slow. Now I havent had my stang long and havent got to run it yet, I will be runnin it for the first time on may 5 at the test and tune. I have about one week to tune my car what can I do to kill this camaro. BTW the guy i bought my car from said that it ran a 14.5 and that was before my mac cold air fender kit, my headers , my clutch and nitto drag radials. So assuming I can drive what are my chances

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88 mustang gt convertible BBk equal length headers mac cold air intake cowl hood nitto drag radials ford racing clutch flow masters h-pipe.