Im after a little info please as i've started on my YB lump which i want to see close to 400bhp. If the engine builders / people in the know would cast their eye over this please and tell me if im going wrong or have missed anything it would be gratefully appreciated.

Spec:

Bottom End

205 Block
Std Crank
Std Rods
Std Pistons
Std Flywheel
Std sump and baffle
New Main & Big end shells
New rings

Oil pump is being checked, but to be honest ill probably just replace it.

The above will be going to woodmill engineering for the block to be pressure tested, assembled and balanced next week. Should i get new main and big end bolts?

Head

Std Head - Polished ports
Std Cams
Std Valves - Re-seated
New Stem Seals
Currently Std valve springs - Should i change to double?
Advised to use Std head bolts
What Head gasket should i use? Head is 139.1mm but i may have it skimmed (im waiting on an answer), block 207mm

Forced Induction

4x4 Polished Inlet Plenum & Trumpets with spacer
4x4 Exhaust Manifold
T34 .63
Grey 403's or Black 55's - which ever i find first
Airtec RS500 style cooler which i want to order, but what size core and outlets do i need?


Thanks fella's