which is better??

I think I am going to go with the Magnum...It's going in my 66 Valiant.....The following is what I plan to purchase (Let me know what you think)

Edelbrock 7577 - Edelbrock Performer RPM Air-Gap Intake Manifolds

Holley 0-83570 - Holley Aluminum Street Avenger Carburetors

Mopar Performance 4876049 - Mopar Performance Intake Manifold Gaskets

Thumpr™, 283THR7
High Performance, Street, Choppy/Thumping Idle

Where can I find the proper oil pan for this magnum