[MiamiHenri]

Hello guys, I need some advice on building a street friendly single turbo 400. My goals are 600-650 hp with a single turbo no intercooler with log manifolds.
So far I have a low compression 400 with ported 6x4 heads,2801 cam, adjustable valve train, flat top pistons. The car is about 3800lbs with a built th350 trans, 2500 converter. Highway gear that I like since I plan on going to meets with the car and drive it as much as possible.
My question is what size turbo will spool up soon and work in my rpm range of 2500 to 5200 rpm. I see a lot of s475 reconditions but I think it might be too big. I also prefer a non v band cold side outlet turbo. Also this is a low budget deal so I been looking at eBay turbos. Also what size wastegate.
I’m tempted to run a turbo with an internal gate. We run them on grand nationals with pretty good control. Any thoughts are appreciated, thanks Henri…