Re: 3.8 is no more
IIRC the front and rear brakes on the 99-04 V6's and GT's are the same. Do not quote me on it but I do believe they are the same. Hopefully someone else can verify.
If the stock brakes are worn it wouldn't hurt to replace them or even upgrade to some Bullitt/Mach 1/Cobra brakes or aftermarket ones.
I would imagine you got the transmission along with the engine too, and the 8.8" rearend. I'm not sure you'd want to pair that 2v with the 7.5" open diff rear.
12 Black GT500 SVT PP l VMP TVS l JLT123 l O/R X l 28x11.50Rx15 M/T Street R's l BMR Suspension l Recaros
03 Sonic Blue 3.8 / 17 Magnetic Fusion Sport 2.7 EB