Meanwhile I disassembled the rear callipers, cleaned them and installed a new calliper rebuild kit. I bought a hydraulic handbrake mechanism and took a honda civic upper clutch pump to make a complete hydraulic handbrake installment. I removed my stock handbrake and installed the new one. I wanted to renovate the whole brake system as much as possible, so I also installed APEX stainless steal brake lines.

As it comes to the engine - I really thought that the head was probably bent and needed some machining, but After an inspection it came out that the block was bend. So I had to take out the whole engine and to take it apart. Well that wasn't what I expected, but I decided that I can do it and started. I did't have a lot of equipment in my garage, but slowly everything was out.
Everything was in pretty good condition, but I decided to replace the main and conrod bearings and also to polish the crankshaft The engine block and head were checked for any cracks and I was ready to put everything back together. The engine also received an oil cooler, because it didn't have originally installed. I guess my car is an GT Apex model but I am not quite sure. New parts on the engine: New original head gasket from toyota, new oil filter, new fuel filter, new engine gaskets, new main and conrod bearings, new Toyota Thermostat:

Engine block cleaned and painted.

Bearings oiled and installed into the block

Pistons oiled and installed back in the block.

A lot of hard work for me getting it back under the hood.

Clean and shiny

Pretty much done. Thanks dad and everyone for helping me :)