Is it possible to keep the factory cruise control and other noob Q's

Getting close to starting an LSx swap, but have a few questions. I've read the FAQ and browsed the forums.

Donor car is an '89 Turbo S. It has the 944 S2 transmission, so it's geared quite a bit higher than the factory one, car isn't a daily driver, it's more of a nice day plus track car. Will I want to swap out to the factory turbo trans to get the lower gearing?

Is it possible to retain the cruise control? If so, how? I drive the car to the track, so cruise would be nice.

What LSx motor is the best one to get? Ie, what year and model camaro/firebird/etc should I be looking for? I just need the longblock, engine wiring harness and ECU right?

What's the latest setup for hydro boosting the brakes?

I can't make more than 371 rwhp before I break out of my class for time trials, but I do want the car to be pretty close to that. Just a cam swap is needed, or will I need to do more to get to that power level?

What I want is working A/C and heat, all factory gauges working, power brakes and cruise control (if possible)...

If you have the Porsche cruise you can keep that, it is on it's own loop. If you do a DBW setup it can be wired for the LS1 ecu to handle the cruise.

Cruise control requires nothing for it to work. Everything should function fine if it did before.

I would not run the S2 transmission. It's worth quite a bit to the 4-cylinder 944 guys. Sell it and buy a turbo trans. I've got one for sale, but it's open diff and non-cooled. Worked great for me, though

You can go with any flavor LS motor you want. Personally, i would save yourself the hassle and just get an LS1 from an '01-'02 Camaro/Firebird. It will have the correct accessory setup, the LS6 intake manifold, a decent computer, and it'll be just a cam swap away from 370 hp. (Note: i'm not saying the LS2 or LS3 aren't better, but the LS1 is proven and plenty powerful, not to mention cheaper)

Hydroboost brakes...well, that's going to be my next step. Until then, no info from me...