Those are actually really decent turbos for a good price. Lots of guys making 600+ rwhp on 4.8/5.3s with that exact turbo.
I have one sitting on the shelf in the basement that I was planning to use on a build, before I decided to go with twin Borg Warners instead.
This turbo is kinda in no-man's land. It's big enough as a single, on a smaller V8, but chokes off fast once the cubes grow....and in my opinion is was too big as twins on a smallblock....at least for a fun and responsive setup.
If you want to stick with cheap ebay turbos, take a look at the ON3 turbos.
http://www.on3performance.com/shop/o...-turbocharger/
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1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq
1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift
1964 Buick Skylark Twin TURBO 383 LS pro-touring project
2014 VW Passat TDI - Daily Driver
Turbo diesel
2015 Sierra Denali HD Duramax Turbo diesel
2023 Ford Explorer ST - Twin Turbskis
2023 Ford F150 RCSB - Whipple Supercharged
2017 Polaris RZR Turbo
2014 Nor-Tech Center Console - Twin Supercharged Outboards
TURBO ALL THE THINGS!!