For a Chevy 250: If i run the custom manifold, along with headers from clifford performance, and a garrett t3 turbo ... is there a strong possibility of 300+ hp?

300hp would be easy. using the clifford headers and a turbo would be very hard. tom

hard to run both at the same time?

typically a person would use a clifford intake and either a fabbed exhaust manifold/ header or the new as cast turbo manifold. using clifford split headers would be a hard job to hook the turbo. because there would be 2 pipes. tom

well i've never done it before so i'm just trying to get yall's opinion on what the hard's and easies will be?

Honestly pop for the manifold from SPA. A well spent $250

got a website for that?

try;
194,230,250,292 turbo manifolds, under our
Hi performance section or
FOR SALE: 194, 230, 250, 292 turbo manif in our classified section

what kind of heads should i run with that? i want that deep throaty tone but not busty like a harley. maybe 2 1/2 with thrush muffler?