Buddies 170 is a DOG!

60 auto motor in a 67 Valiant..We tuned it as well as we could. New plugs, has ECU already, rotor, cap, wires, timed it to about 2.5 BTDC as the '60 specs say (the mark on the timing cover is not real visible, but there is one about 1/2" under a "0" we saw) a few degrees either way didnt seem to change much of anything. He has an unknown model BBD on top of an 2-1 adapter to a 1bbl intake, not the best but there are no leaks. We fixed the accelerator pump shooter that was plugged so we now dont have a bog but this motor is a slug. No working kickdown either (just bought it so he has lots to fix) but even in low, this car could only make about 10mph up a ~25% grade. The vacuum is at 15 at idle, drops to <5 when he revs. the distributor is hooked up to manifold vacuum off the carter carb. Does it need to be ported vacuum? I ran into this once and cant remember what vacuum worked best. The motor is tired, only 90 psi on #1, probably the same in all the rest as it idles pretty smooth. He adjusted the valves and has yet to get back to me but are there any theories on what we should be looking for? Choke is all off at hot. Stumped but never worked on/driven a 170...probably a 2.76 rear. Thanks.

Random thoughts off the top of my head:
Hopefully the valves have been adjusted correctly. All 6 cylinders should be checked for compression.
Distributor vacuum advance should be connected to "ported vacuum".
For tuning purposes,I would take the vacuum advance out of the equation,and plug it at the carb. Slants like 30deg max of total timing. Set the total timing first. At this point,whatever the initial is,it is. Make sure the distributor is dropped in where it should be. Put the motor on TDC (compression stroke)and make sure the rotor is pointing at the no.1 tower on the cap. Make sure plug wires are in the correct order. Sounds like you have all new ignition parts,but the ignition is where I would start first. Then I would go to the carburetor.