Dont know the american equivilent
think you will find it came off a first gen magna TN ot TP EFI
now you can try using a TR/TS from a 4 cylinder EFI
it would be the height of the plenium that would make the difference
the TR/TS had a bigger throttle body
also you may need the engine management computer off the TR/TS 2.6 4 cyl to make the best bang for your buck
TP and a TR inlet manifold
if going carby they are the same inlet manifold
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