New engine issues

If as you say everything has checked out, then it has to be the combo.
The Wallace Calculator predicts 133psi cylinder pressure@722 ft elevation. I predict vacuum less than 10 inches at 800, if you can even get it down to 800.
I think yur gonna need a 3000plus TC and 3.91s atta minimum, just to get moving.

I agree about doing a compression test, and
don't forget to set the Transfer slot exposure to a little taller than wide, and set timing a lil on the high side. That cam likes extra idle-air and extra idle-timing. Make sure the PV is not dribbling.

On my 360, with a working PCV, I had to drill one hole in each throttle valve to get the Transfer slot set up, and she liked 18* to start with. I don't recall the hole size, maybe 1/16 to 5/64 each. Sneak up on it. If you go too big on the holes, then you will not be able to slow the idle speed down enough and still have about 14 to 16 idle timing with a manual trans and perhaps up to 4 more with a hi-stall.
The holes go in the primary valves on the T-slot side , about halfway between the edge and the shaft somewhere in the vicinity of the T-slots. As the holes get bigger you will be able to idle it down by taking timing out. Leave the transfer slot a little taller than wide.
If you have an automatic and the in-gear idle drops more than 150rpm from neutral-idle, then the neutral-idle is probably too high, take some more timing out. If the in-gear idle drops to less than 650 and she won't take throttle, and you are at less than 14* timing, your TC is probably too tight.

If you make the holes too big, don't panic. Just chamfer them well, and solder them shut. Then move over and start again. Yeah that happened to me in 1999. 100,000 miles later, and the solder is still in there.

After you get the idle sorted out, limit your power-timing to 34/36* all-in, but not including the Vcan.