360 runs great one day and then poorly the next

I also want to add, that with my fuel pressure situation, I had the same poor (loading up) results with 2 new Holleys and a good Edelbrock carb, until I replaced the expensive pump with a stock cheapie. I could have achieved the same end results with a fuel pressure regulator, and still plan to add one of those soon.
The Edelbrock that was on it before the TQ was installed run fine for years. Stock fuel pump is working at required pressure.