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"Enough" cooling is a relative term. I had an RX7 oil cooler in the front of my 911 with a 930S fiberglass spoiler with no tub modification. It cooled both my 2.7 and my 3.6 on the street without any problems, but at the track it just didn't quite get the job done. It was probably a combination of inferior airflow and cooler type/size, but a replacement with a fatty B&B cooler & tub notching solved track overheating problems.
If it's just a street car, I think you'll be fine without tub notching. Click on my "B&B" link in my signature to see pictures of the old cooler mounted without notching the tub. It will give you a good idea of how much room & what type of airflow you can expect.
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