i run a 4wd cossie turbo on the cossie 0.48 housing and modified cosworth downpipe to aid flow.
comes on boost on my 1.8zvh at 3000rpm, right up to 21psi and shifts well, seems a little restricted up the revs though, but maybe the head that's holding it back.
i'd think a T34 would be a little laggier for sure, which is why i'm happy with the cossie turbo.
if anything i need a better box to handle the power as i'm going to fit my third soon