slant six help needed, burning oil

My sister purchased a 63 valiant with the slant six 3 on the tree. I have been working on it for a while now. It was running when she got it but would die while coasting to a red light or stop sign etc. Took starting fluid to get it going again. Guy she got it from said it had been like that a while, said he rebuilt the carb hoping to fix it...I suppose paper clips and staples may be in carburetor rebuild kits.

I figured that to be a daily driver for her I would do a few things to it and see how it ran afterwards. I ended up replacing both the intake and exhaust manifolds, nos carburetor, fuel filter, oil and filter, plugs and wires, converted it over to electronic ignition so new distributor, rotor and cap, ballast resistor and an electric choke, bit more then I had planned but that's how out goes at times.

Now the car starts up and runs reliably but it's smoking like a train. Pretty heavy oil smoke. It was not smoking at all prior to working on it and I am kinda at a loss as to what the hell happened. I checked the timing, it's about 5 degree after, dead on tdc with the advance plugged. Yet to check compression as I just can't imagine it suddenly going from good to bad just like that.

Any guidance would be greatly appreciated.