You didn't say whether you want IDA or IDF? What heads do you have as most of the manifolds are for a 4V head.
You can buy used parts, but you'll likely spend as much in the end as the cost of rebuilding and tuning them is not cheap.
The benefit of using Jim Inglese is you can give him your engine specs and he'll build a system that is pretty much guaranteed to run out of the box.
Julian
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