with fitting the gearbox in, if your 1200 came originally with an auto then the stumpy box fits in, depending on the angle you have your engine on when making the mounts you may have to massage the tunnel slightly.

Manual tunnel you need to really bash the crap out of it to fit or cut and shut a larger tunnel in.

With the silvia 5sp you need to no matter what tunnel you have cut out the rear section and make up like a box instead of a hump (check dattoman's website for pics) as the silvia box near the gear stick is a big block, also your handbread has to be relocated back as the gearstick now comes out 8" futher back then when it originally started.


The pintara master and slave shout be fine as long as your not running a brake booster, because if you are running a booster you can't use an engine bay mounted clutch master as it will foul with the booster (they overlap), in which case sus out a nissan Urvan they use in cabin masters (I have this setup and can provide pics).

To get alot of power out of a NA CA, I'd go big cams, aftermarket computer, quad throttle bodies, maybe even eater injection to help cool the donk.

Tomei or HKS are very good with their cams from what I've heard.


Wiring is easy as long as you can read wiring diagrams, then yes it is as simple as splicing in all the apropriate wires to the computer from your existing loom and the computer loom, turn the key and aye presto (providing the ECU has been base mapped for a CA18DE).


You can use the boshe external coils and mount them on a rail off the engine and run leads to the engine, this would help eliminating heat damaging the coils, yes some coil packs don't like heat too much and break down when hot.

I hope I've answered all your questions


Cheers
Damo