The best setup for autocross on very small tracks

[Ivan141]

Hmm... I'm no setup expert, but I can try and give you some views on the parts you mentioned.

First the chassis. Rust removal and seam welding are always a good thing to do. Weight reduction without buying any fibreglass parts is mostly done by stripping interior panels and unneccessary seats. If your going to paint it, remove the sound deadening material on the floorpan, that's good for quite a few kilo's as well.

Suspension: the place where you will need to spend most money.
I have tokico blues myself, they are nice for sporty driving, but I would buy some adjustable koni's, maybe even shortstroke (ae92) shocks.
Especially since you want coilovers, weld the whole thing up nicely.
Spring rates around 6 front and 4 back are very popular for a track car that has to be streetable. Any lower on the front and you will have problems with rubbing tires all the time (which is what I'm experiencing at the moment). The only adjustable link I would get is the panhard rod. All the other ones only take away a bit of slop at the joints, and add some strenght.
Camber plates might be a good idea. being able to adjust the amount of front wheel camber can be very usefull for you to find that ideal setup.

Lastly the engine:
1 if you rebuild the blue-top, maybe use highcomp pistons...
You could make the bluetop more usefull for 2nd and 3rd gear runs by using a shorter final drive gear set. That would give you some faster acceleration.
2: 7AGE seems to be very good for torque, but it will take less of a beating at high rpm than a 4age will.
3 20v is a very nice engine, but I think you would be better of spending the money on your suspension. With a shorter final drive the 4age will propel you just fine around short tracks.