Yah, no reason to change out the parts if they are working. The new stuff is more advanced and less expensive but since you already have parts might as well use them. You can probably clean up the plumbing a little bit by moving the regulator. I'd put it on the return side of the system rather than on the pressure side but it should work either way.

Be super careful when you install the Sniper wiring. You have to keep all Sniper wires away from the high voltage plug and coil wires. The Sniper will go crazy if a spark plug wire lays on top of a Sniper wire. You need at least a few inches of air space between Sniper wires and any spark plug wires. You'll also need high quality resistance wires and resistor plugs. I use Firecore 50 plug wires on all of my installs.