Basically the motor needs three things to run right.
Fuel, air, and good spark. Anything that interferes with the proper delivery of any one of those three things will cause the problems you describe in a motor with good compression.
Have you done a compression check? If so, and that checks out:
Start with a good tune up including spark plug wires and filters, then replace the vacuum hoses even if they look good because they are cheap and looks can be deceiving.
Make sure you set the timing properly. Next move on to that fuel line. You'll probably have to wind up with some part of it being rubber because of the aftermarket carb, but at least make sure it's new, good, and tightly clamped.
These are basic things you want to do to a car that is new to you anyway.
If you still have a problem after the compression check, tune-up, and changing the vacuum and fuel lines, then you can start to narrow it down from there.
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