Worked on the rattle last night.
It was the driveshaft loop. It was just barely off the floor board so the vibration of the engine caused the loop to move just enough to tap against the floor board making the sound worse than what it the problem was.
Wedged a piece of wood shim between loop and floor board and took for a drive and no more rattle. So just have to bend the loop down a bit so it does not hit the floor board while the car is running.
Thanks for all the suggestions,
Mark
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1965 GTO: 467 (Built By Dan Willever), 400 Block, Eagle 4.25 Stroke, Eagle 6.8 Rods, BRC Pistons, Custom Grind Hydraulic Roller Cam, Edelbrock 72cc Heads Ported, HS Rockers, Doug's Headers, Edelbrock Victor 4150, QTF 850 Carb, AutoGear M22 4 Speed, SPEC Clutch and Pressure Plate, 12 Bolt 3:73 Posi.
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