Yeah, worked in the turbo industry for years, I'm trying to keep the turbo for this swap easy to attain and cheap. The Garrett T2560 I got from a Isuzu 4HE1 looked to be prefect but it turned out there are different turbine housing sizes and the one I got was a big .80 A/R
Yes everything I have seen points to the 4BD1T not having any issue with boost pressure. I believe 30psi is nothing for one, a guy a few years ago lifted the head on one when he pegged a 60psi gauge stock unopened engine. I'm not interested in anything like that.
My motto with this swap is Reliable/Efficient/Serviceability I do not want to sacrifice any of those in search of a number or power target.
30 psi would be sweet with the correct fuel to suit. That thing would PULL! I too am about reliability.
If you know of a good turbo to suit the engine without breaking the bank I am all for it. I recently picked up a 1hd-ft's CT26 for what I think is an excellent price. Its for my 75, I going to try and get the bits to upgrade the compressor to a 7mgte set up mainly because I can't afford another gturbo any time soon and this will be a fraction of the cost. Should be fun.