While my '89 was NA, I built it into a very nice IASCA SQ car. It was something that I could do. It doens't have a whole lot of that left in it. After I got the turbo engine, someone broke in and ripped out most of the good stuff. I kind of patched it back together to have music, but I never rebuilt the system properly. I was pretty happy with the NA Supra... But not enough to pass on the opportunity to buy and install a 7M-GTE.
I discovered that a V8 GM fuel pump blockoff plate is identical to the J tube blockoff plate. (Of course the J tube goes where the mechanical fuel pump went in the pre EFI days. It used to be driven off of a cam on the oil pump driveshaft. A distributor used to be driven off of that, too. The gear is still there for it.) My guess is that the mechanical fuel pump was probably very similar if not identical to the GM one. I recognised the pattern a long time ago, but today I determined that they are in fact identical in bolt pattern and shape. Nice thing about the ones for the GM is that they're cheap, and I can just pick one off the rack at the local parts shop.