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You should do a leak down test first and find out where the problem is.
You can get the leakage for each cylinder and then listen to where the leak is coming from to determine if the problem is valves or rings. If you had the heads done with you top end, it's likely to be worn rings.
If you determine that it is the rings, usually these can replaced and the cylinders de-glazed. The pistons and cylinders are usually within factory wear limits and the rings take the wear.
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Tom Butler
1973 RSR Clone
1970 911E - Sold but Never Forgotten
914-6 GT Clone
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