From reading this and your other post I suggest three different options for you.

1. Find a reputable engine builder in your area and take the motor to them with a list of performance and drivability requirements that you hope to achieve and let them have at it. Write the check and then swap the motor into your Chevelle

2. Set this motor aside and purchase a crate motor with the HP you want. Write the check and then swap the motor into your Chevelle

3. Enroll in an automotive tech series at your local community college and build your motor as a class project. Then you buy the parts and have an instructor and fellow students to help you.

Number 3 will take you the longest, but in the long run it will be the cheapest and give you the most benefit. It will also help you discover if you really want to get into this maddening and addictive hobby. It will also put you in touch with other folks with this interest that you can learn from and hang out with in the future.

Pat