"64" Dart 8 1/4 swap

I recently bought an 8 1/4 out of a 1976 Valiant for my 1964 Dodge Dart convertable to replace the 7 1/4 one.

I am looking a new leaf springs for the install but I have no experience in choosing the correct ones. There are original from JC Whitney or racing from Summit. General Springs has what looks like an original replacement. JEGS has a racing spring.

My thoughts are trending towards the Mopar 2800 (lbs) racing springs from Summit and then adding V8 torsion bars (S6 in car) in the front to stiffen up the ride a bit.

Can anyone recommend some options I should be looking at or "best known methods" for the swap?