Onebdgoat

Hello everyone,

long time lurker, first time posting.
I’m building a turbo 5.3 to throw into my 66’ GTO clone (calm down purists), and need some help. I’ve ready through many forums and still need advice on a few parts

Currently have/getting:
-LM7, planning on keeping bottom end stock
-LS9 mls head gaskets
-ARP studs
-Deka 80’s
-sumped stock tank with external walbro 450
-862 heads
-stock TB and truck intake
-flipped manifolds
-Holley fuel rails
-eBay intercooler
-built TH375 w/ 2600 stall (I think, it’s been awhile)
-3.42 10 bolt posi

Planning on keeping the 10 bolt until it dies, then probably a moser Ford 9” with 3.08’s.

Id like to make a reliable 650-700rwhp on 91 and 800 if running e85, maybe room to grow in the future. Probably won’t see many trips to the strip so I’m looking to build a fun street car.

Im on a budget, so a Precision turbo is out for now, and opinions are all over the place with other turbos.

My questions: T4 or T6? A/R? Sizing? And single or dual wastegates?

Looking at a BTR turbo cam kit with 7.4”(?) pushrods and springs with titanium retainers. Stage II or III?

should I gap rings?

I’m leaning towards a T4 s475 or a VS racing 7875 with a billet wheel right now but options/comments would be greatly appreciated!

Am I missing anything else?

Thanks!