Made my final decision on the engine build and most of the parts are here :
F54 block 20thou overbore flat top cast pistons
N42 head 30thou skim, 3 angle valve seats, head ported and polished, gasket matched
Schneider 274F camshaft 480 lift 274/274 duration, new uprated springs, retainers and lash pads
triple 40 webers on twm manifold
Not decided on the exhaust manifold yet or whether to use my 280zx box or the borg warner t5 that's currently in the car.
Just hope I end up with some good usable power