Yes. Looks like 2.5" all the way to the tailpipes.
I wouldn’t open up the hole more than 0.950”, be sure to radius the inner edges of the hole to smoothen air flow.
You can always go larger (no more then 1.10”) but you may have issues building boost if you go too large a hole at first
I have a set of valve springs from Kirban. Planned to put them on the '86, but sounds like they need to go on this one now. I'd like to make this turbo work if possible. Not really wanting to spend 1K on a turbo right now. How close should I port the wastegate hole to the diameter of the wastegate puck? Should it be 1/8 smaller or is that too little? Is it more likely to crack if the wastegate hole is too close to the diameter of the wastegate puck? Pretty sure it's the "biggie" puck, but I'll have to measure it to know for sure.