Thank you.
From what I have read, the dropped seats often occurs after the engine is run hot, shut down then restarted.
I've never gotten close to overheating. Once the radiator showed signs of leaking, I replaced it. Same with the water pump.
I'll save this original engine and decide what to do with it. I may build a wilder version with a long stroke crank, better heads and cam but still with streetable compression. I've considered the 5.7 Hemi and a 500 or 518 OD
for this car....