there's no firewall mods required.
this has been discussed plenty of times before, start with this:
L20b into a Datsun 1200..and if you've got any other questions let us know.
It doesn't take much to get them handling really well. My setup is really simple and uses no real fancy parts:
- Stanza front struts and brakes - adequate for a road car, but not really much good on the track. I've been meaning to upgrade the brakes for a while now...plenty (too much) info out there about brake conversions.
- Monroe GT Gas inserts and cut down and wired in Gemini coils
- I can't remember now which front sway bar is on the car now, but its either the standard one or a 120Y bar. I think its the 120Y bar.
- rear end has a 17mm sway bar, a set of leaves I put together from a combo of 1200 and 120Y leafs with a reverse half leaf to control tramp.
- revalved koni shocks. until earlier this year I was using 2nd hand Pedder comfort gas shocks in the back and they weren't all that bad.
- geometry at the front end is pretty important for a track car. Its a battle to get enough camber, and you want all the castor you can get, and you will need to trim some of the front gaurd away to get anywhere near enough. A suspension shop speciallising in race cars is the go.