440 engine mod help

I have a rebuilt stock 78 440 out of a ramcharger in my 73 duster. I am thinking about putting a performer RPM manifold and a comp Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 268/280, Lift .477/.480, Mopar, Big Block, Kit in it. Is anyone running a similar set up and how does it work or is this to much for this motor with the compression it has. I also have a holly 750 to put on it.

Additional info.
full manual 727 trans
8 3/4 373 Detroit no spin
SS springs
.920 torsion bars