LT1's came in the 93-97 F-bodies, Camaro's and Trans AM's. The LS1 came in the F-bodies in 98-02. The LT1's have insane bottom end torque, but lack peak hp. LT1's typically dyno 260-280 rwhp stock, less for the auto's.
LS1's have a little less low end torque, but MUCH better mid-range and peak power. The 01 and 02 F-bodies came with the LS6 intake, which gives them an edge over the 98-00 LS1's. Typical dyno numbers for 98-00 LS1's are about 295-310 rwhp. For the 01-02 models it is usually around 305-315 rwhp.
The different between the SS and Z28 is minimal. The SS has the hood, spoiler,
suspension upgrades, exhaust, and other minor differences. The scoop on the hood is acutally more like a cold air intake, it is not sealed. This and the exhaust gives the SS slightly more hp than the Z28, but they are practically the same.
For reference, my car made 321.9 rwhp and 340.3 rwtq with just
Flowmaster (aka Crapmaster) catback,
K&N air filter, and a induction lid. With the cam and crappy mufflers it did about 367 rwhp and 374 rwtq. The car is making about 325 ft-lbs of torque by 2700 rpm, and over 350 ft-lbs by 3600, so it's not all top end. Now with decent mufflers, throttle body, UD pulley, and soon an LS6 intake, I will expect about 390-400 rwhp. An easy N/A opponent for an 03 Cobra. With my moderate amount of weight reduction I'd anticipate to run low 12's. If stage 2 ported heads are added, the car would be making around 440 rwhp, but thats in the distant future.
Hopefully this gives some insight on the power of Camaro's and you can determine what you need to do to match dyno numbers. I am not very knowledgible with Mustangs and mods, so I cannot suggest what and what not to get. Maybe some of this info will help you. Good luck!