Two great places, each one on either side of the GTA.
Near Peterborough, to the East of the GTA is Angevaare Motorsports.
Angevaare Motorsports, Lakefield, Ontario. 1,017 likes · 156 talking about this · 29 were here. Motorsports team offering custom fabrication, performance aftermarket parts and service. We have...
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A father/son business where they do mostly custom fab work for motorsport enthusiasts. They have their very own LS-swapped Miata. They'll definitely be able to do the work for you.
Second, on the west side of the city, on the east side of Hamilton is NV Auto.
NV Auto is the premier race prep and fabrication shop west of Toronto. Though we have built our name on our Subaru repair, we have a full fabrication shop and an in-floor alignment rack. We also offer basic maintenance and repair to all makes and models.
www.nvauto.ca
They specialize in Subarus but have LS-swapped a Porsche and have multiple vehicles of their own that they've put a 2JZ into.
Either one will do great work and are run by great people.
Tell them I said "Hi"!