Welcome to the forum
Be sure to read up on flat tappet cams and their proper breakin and the correct oils to use with one. You can not run most off the shelf oil with a flat tappet cam. It looks like you purchased a generic cam and lifters which are more prone to failure.
More than likely the issue with your Edelbrock carb was too much fuel pressure. They are extremely sensitive to fuel pressure. They can not tolerate any more than 5.5 psi. Unless you have the Performer RPM Air Gap Q-Jet intake, you will need an adapter plate to install the Q-Jet.
Good luck with your engine work.