if it gt40, the turbine a/r should be around .85 to 1.19..... i like the a/r .95 for 4 cylinder application.
According to owner the comp. inducer is 63.5mm same as the gt4088 and the turbine exducer is 76.2mm a bit off from the 77mm for gt4088. The problem is, gt40 normally come with a/r .52 (4082) or a/r .72 (4088 & 4094) compressor housing.
better get the full spec of the turbo, buyer will be more interested if the spec is correct. eg:
compressor
a/r:
inducer:
exducer:
trim:
turbine
a/r:
inducer:
exducer:
trim: