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I never did a weight or cylinder wall thickness comparison with another block but when I built my 408 I used a 360 block dated march 73 and had it sonic tested and my machinist said it had some of the thickest cylinder walls he'd seen and he'd been testing them for 40 yrs. It's been over 12...

He didn’t say if his was a notch back or fast back. Maybe his is a notch back and I’m guessing yours is a fastback by the weight, which btw is on the porky side of even a fastback. My 68 fastback is 3440 without me

If you have trouble finding what you need let me know. I have a bucket load of them and can send you some

I've cleaned up gears that were no rusty than that and they were quiet afterwards. But the guys have a point about checking the bearings since there's rust on the gears

I didn't read through every post but your findings don't surprise me RRR. When I was young (the 80's) and working on a lot of low compression, no quench, bad chamber engines I found most of them ran better when the vac adv was hooked to manifold vacuum. When I was tuning my 408 (10 to 1, good...