Whats the best sized turbo for a 5.3...

Im not going with any of the kits already done..

I know a person that can fab the piping and stuff up really easy..

I figure doing it like this will be a TON cheaper than ordering that stuff from a company...

What size..

Stock Bottom end... Cam springs pushrods...etc..

I want to run around 5-6psi, with I guess 43lb injectors!!!

thanks