It'll be 2879153x's easier and cheaper to find a 2tg head and bolt it back together,
rebuild, put the 40mm webers on and get it tuned.
18rg's aren't cheap and aren't a direct bolt in either, including things like gearboxs and crossmembers.
I have a 2tg in my ta23 and speaking from experiance they are pretty quick and alot of fun to drive.
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