Awesome foundation to start with. Know this, factory 383's were not available with power steering. However conversion mounts and headers are available now so you may install that big block and keep your power steering. Www.engine-swaps.com
our 69 'Cuda 383 S, has power steering and brakes from factory.
Of course its a FB, not notch if that makes a difference?? (same engine compartment space).
