Thank you for your reply @Bean, and your post about head studs!
My plan for the engine management system is to use Electronic fuel injection with bigger injectors. Haven't decided on a brand yet, that depends a bit on what brand the "tuning-guy" prefers!
Currently I dont have any particular plans for the exhaust manifold.
As for the intake manifold I hope to reuse the original intake, maybe give it to a guy to enhance the flow-rate.
Cheers,
Endre