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One of the current issues I would struggle with is the timeline associated with sitting on the gearbox and bottom end before they are sold. The market is not exactly ripe for 6 speed swap when as 5 spd is stronger and is (for all intents and purposes) a bolt up affair. It can very easily take up to several months to sell the bottom end (although it does come with a 8CW crank, which is another benefit if building an engine and using a fair amount of the P12 components).
In all honesty, properly radiusing the valves and seats will net you a fair amount of gains on the head (even with stock size valves).
One can build a reliable 500HP RWD VE for under 3K all said and done (P11 head with associated hardware and swap kit, $1000, blown bottom end for $300 with accessories, swap kit $300, forged internals $7-$800 and machine work $5-$600). The devil is in the details (larger supertech valves - $450, P12 cams - $350, more head machine work -$4-$500, etc etc. Gets expensive quick once you start to tack on all the odds and ends and shoot for 600+ WHP, which any 4 cylinder 2 liter engine you are shooting for a reliable 600WHP is NOT going to be cheap to build).
Its all intended goal. Track days, go with the larger stem diameter P11 valves (or grab a set of Inconel exhaust valves). Lighter rev happy valve train that you are not shoving 600WHP worth of heat down for 20 mins at a time, go with the P12
YMMV.
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