Anything up to and including mk3 engines will go in on standard mounts.
I would work out what class/series you want to race in as each has different engine rules, I know some require you to have an engine that came in that model of car where as some are quite free.
In saying all this, a 16v swap is probably the way to go, more power straight out of the box and you would be able to take it further than an 8v.
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