I think you did good to let that pass by,
An engine of that caliber would cost upwards of 8,000 from carb to pan,but you definatly will have a real nice engine.
Don't be fooled by the low prices,it just might cost you double and then some.
Read the user feedback part of the site,I'd also reccomend asking us here if you find some thing that interests you.It might save you some grief and money.Beware who you give your hard earned money to.
And yes there are some good builders here on the site that have built combos like what you are looking for.
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There Is 1 Thing Better Than Cubic Inches,,,More Of Them