To the original poster... Do you have a bypass oil filter? I recently ran an oil pressure experiment on my V8. Since I had used fuel injection rated 5/16" hose for my return line from bypass filter to sump I was able to clamp a pair of duckbill vicegrips on the return hose and saw a 12 lb instant rise in hot idle oil pressure. My restrictor is intact and on the incoming line to the filter. I'm not saying to run without a filter, but I d I have seen a lot of low oil pressure threads here lately so wanted to share what I found last week. Another thing to check if you are running the stock gauge is the sender. On the current engine I had a 50 lb dash gauge and an 80 lb sender. I found a 50# sender on the engine I had pulled out and oh what a feeling. Pull your sender and if is not marked it's the correvct one and if it has 80 stamped on the square boss, you will in for a happy surprise when you install a 50 lb sender. I hope either of these can help. Worth a try.