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.