4A-GE Tune up

[apardal]

This topic might get similar to harkes' but I have somewhat different questions:

I might be able to reach a set of 264º 8.5mm lift HKS camshafts and I would like to know what to expect from them in terms of power output.

The items that I predict to install are the following:

- HKS camshafts
- Stock intake headers
- Fuel pressure regulator
- 4-1 TRD spec complete exhaust system or stock 4-2-1 with TRD spec secondaries and muffler
- 0,8 mm TRD metal head gasket
- some (little) head work
- stock ECU
- fidanza adjustable cam gears

now, the questions:

- should I go for 4-1 or 4-2-1?
- will stock valve springs be enough for the new lift? will i have valve floating at high rpm's?
- will I need to change the rev limit?

The car is for weekend and track use. It will need to pass MOT and my budget is limited. Please, help me with some wise options for this specific tune up!

Thanks a lot

Best regards from Portugal