65 Barracuda daily driver

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So the timing chain is in. I ruined the timing cover gasket because coolant kept pouring out of the one of the driver side bolt holes in the block. It appeared to have stopped. I tired to jack the front up, but that didn't help. I tried to get the block drain plug out, but I couldn't. It's hard to reach between K-frame, motor mounts, steering box, etc. I got a wrench on it, ut no way to turn it. Are the driver side and passenger side connected? So if I drain the passenger side, will it drain all the coolant out? Anyways, I was able to get enough coolant out with a hand pump through the upper water jacket to make it stop. No store had just the timing cover, so I had to get another full set with the water pump gasket etc. The little cork end gaskets also didn't work that well, because they wouldn't stay in place when bolting down the timing cover, so I just used black RTV instead. Anyways, it's back together.

While I was laying under the car I noticed that the driver side exhaust stud is still leaking coolant. It's got a heli coil in it and I've tried to fix that 3 or more times now. It also appears that I have some valve issues, because the timing fluctuates a bit and I can't get adjust the idle to get more than 14 inches of vacuum, which also fluctuates a bit.

So, since the coolant is already out below the heads, I was thinking it would be a good time to swap in these 675 head that I recently got from a FABO member. They were rebuilt by a shop about 5,000 miles ago with stock springs etc. Currently I have 163 smog heads on there and I'm pretty sure they're junk. Any thoughts?

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While everything was apart I also tried to install the BPE bracket I got at Spring Fling, but it looks like that's not going to work with my pulleys and my compressor. I also have a CVF racing A/C bracket, but that one doesn't work without their alternator bracket. I will have to make my own bracket I think.