Just rebuilt my 292.  The engine had been (previously) changed from the canister filter to a FL1A and I replaced the o-ring on the adapter.  On initial start the oil leak was severe.  Traced it to the adapter and replaced the o-ring again.  Torqued to the required 25 ft.lbs.  Engine cranked and ran for approx. 10 minutes with no leaks.  After sitting for a month, the leak is back and maybe worse.  Oil pressure is normal.  The only modification is from a stock 2-barrell to a Mummert aluminum 4-barrell, Edelbrock carb and added power brake booster.  Otherwise, stock.