For the cost of the parts - why not get a vortec 4200 out of a Saab 9-7? The 2008 engines were 291 HP STOCK. Build a header and do some exhaust port work and you will have a 325HP engine.
Or add a turbo and get 400+ HP easy...
A break down of parts would be a good start.
Forged pistons, cyl sleeves + cost to install sleeves.
Two piece billet turbo exhaust manifold.
Port & polish + larger valve installs on 24 valve cyl head.
Custom camshafts.
Trans adaptor as to run a TH400 4l80E , etc.
I know there is more to it than what I mentioned.
A ball park price on these items would be good.
MBHD