B&M Converter is bad

Now sort out the low side.

Make darn sure you don't have a vacumm leak. Even a small one will cause havoc with idle settings.

I wouldn't drive it, I'd grab the distributor and twist in CCW a bit, readjust idle speed and see how it goes. Find the point that the car has difficulty starting while hot, then turn it slightly cw to get it so it starts easily. That's where you want it for initial. Put timing light on it and subtract that number from 38 and that's what you need for mechanical advance. I mentioned 16-22 before and that's usually where that style cam will likely end up.

Have a vacuum gauge handy, set idle at 800, mix screws at 1.5 turns out and then find the leanest (in) idle with highest vacuum reading. Then back them out another ~1/8-1/4 turn. The RPM drop should not be excessive. Make sure the distributor is not dropping timing out when it goes in gear. Will take two people, drop it in gear and make sure the timing remains where you set it. If it's less you have an issue and dist weights need a stiffer spring set on them.

Same set up in a 360, XE268H and a 750 DP... 16 initial 36 total.
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~800 in p/n, ~700 in gear