Engine Bogging

[chevyc1068]

I got a '68 c-10 with a 307 in it. The only problem is when you step on the accelerater it will bog down and sometimes dies, only if you barely press on it will it rev up but any amount of acceleration will bog it. This is all just sitting out of gear not driving. Although it does the same when driving. Now the funny thing is with the choke on it will run perfectly. Even when it warms up to normal temp it is exactly the same. I put a new accelerater pump in and replaced the carb gaskets along with cleaning the whole carb out. Put in new plugs the other were worn out and black. Put in a new condensor, have new points just have not got there yet. The plug wires don't look like they would be a problem. I have tried tuning it but all it has is two mixture screws but maybe I just have not tuned it quite right yet. I have a new coil for it (again not got there yet).

Please any help on what to replace or what to test or what might be wrong would be very appreciated.