the t-25 will not bolt up to a t3/t4 manifold, you will need to make your own manifold adapter plate, use a hf manifold and make a adapter plate to fit it to bolt the t-25 up too, you will also need to make a custom downpipe

Here is a website that might help you out
www.homemadeturbo.com
t-25 are used commonly on there for setups
do some research