Where to buy 426 stroker? Recommendations?

Clutch pedals, linkage, and bellhousing for that matter; I'm guessing you'll have to source locally. Those kind of bits for RHD cars are non-existent over here... although I suppose a left-hand bellhousing and hydraulic linkage could free up valuable space on the right hand side for you- nonetheless it's something to keep in mind, especially when it comes to header fitment. I'm relatively certain LHD pedals won't fit.
You'll have to get creative with an A/C kit from here, too. Your heater box and dash are reversed from ours; you may end up being better off sourcing that locally, too.
Many of our transmission kits are going to offset the shifter to the left hand side of the tunnel to conform with US production cars, which could be an awkward issue in a RHD car. The Tremecs have multiple shifter positions, so you should be able to find something that works, just be aware of the shifter positioning difference in some U.S. A body "bolt-in" kits. Here's a pic of a TKO setup to illustrate what I mean:
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