Back for some more help on my slant six project

Hey all. Came back to update everyone on my 75 duster problem. so i fixed some wires here and there and now she turns over. It was all help to a buddy who suggested me do hei conversion. so that has been done as well as the installation of a new coil ( Accell super stock coil to be exact) and a refurbished distributor from oreylles. so the big day comes and she turns over and idles decently then i play with timing on it and everything seems to be doing great. next i try to take her for a spin but when the accelerator is pushed down, there is no power, just crazy sputtering and misfiring. i was going max 5mph with the shaking of the engine. any idea what could be going wrong?