69 Chevy 250 motor

[Novicecarguy]

Help! After reading multiple threads I can not fix my problem. I have a 69 Chevy C20 with the 4.1 L 250 with a Rochester monojet Gm.
Issue is every time I shift and put the motor under load at low rpms the motor spits and stumbles just for a second.

Here’s alittle back ground.
Coil replaced with MSD baster2 and ballast resistor
New spark plugs and wires
Installed a fuel filter
Cleaned out carb mainly just the float bowl
New distributor cap and rotor

Here’s how it began
Last week my truck died on the side of the road so I got looking under the hood and found the wire off the starter cilinoid to be melted and split apart( wire went to dash and coil) so I did a bush fix and got her home and completely replaced the wire. All running good at this point. A few days later I installed a fuel filter before the pump. All was good until I found the fuell gauge stuck at the 3 o’clock position. Fixed that now back to square 1. So I proceeded to install a new coil plugs and wires along with cap and rotor motor now running a lot better. BUT found a wire smoking at the plug as it enters the dash so I found I needed the MSD ballast resistor. So again all running good until I get on the road and the motor spits and almost hesitates. So I go through countless threads and nothing is working!
Did I do something wrong? Do I need to look more at the simple stuff?
Where do I begin?
Any help would be appreciated!
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