[alffie]

You wont be able to build an engine cheaper than a crate motor!! Your choices are very limited, its either LS series engines or the Ford boss series, Iam not sure if you will ready in time to use a 5L windsor.
There are holden dealers around that have been selling LS2s under $5000 brand new and T56 for $2500.
The main reason I went with a CR is because all the parts are brand new and the body is all one piece. No mater which kit you get you will have some issues you will need to sort out along the way.
Ive also found that the kit makers arent that more expensive for the parts, by the time you find someone else withe the parts they often turn out to be similar in price.
Getting a roller will save you a lot of time and work, get a painter lined up now so when you get the kit he will take it straight away, otherwise you will be waiting a while for paint.