Hi I'm new to all this cosworth stuff need some help on rebuild as I haven't done one before ! Here's the spec

3 bar map
Rs500 intercooler
Polished crank and con rods
Standard pistons with pockets ( not sure what size valve cut outs I need )
Bd16 inlet
Bd14 outlet
Ported and polished , inlet 25.5mm and 24.5mm outlet
T4
Wrc head gasket
Group A oil pump
Group A coil
Group A fuel pump
Siemmans black injectors 83lbph
200 block
T5 box
Sure there is loads more that I have forgot !

Any help would be appreciated Looking to get 500bhp+
The 2wd cosworth was running on greys I need help with what chip to get and best place to get one