It's tight but I found a silicone boot that fits kind of. My turbo has a weird 4.25" inlet so i had to slice the silicone (because it was 4") to get it to fit. Honestly, I'm not really worried about it.
I did end up taking it to the track this weekend and I must say I'm 100% happy with everything in the turbo, fuel, and engine setup, but unfortunately the freshly built powerglide isn't holding up. I ran 10.9 @ 129 mph. Pretty frustrating, but hopefully I can get the transmission setup solid and then get the Ronin 8.8 IRS ordered and go back for some mid to low 10s.