Your turbo distributor will work fine, you can also use a NA one like you thought.
I'd recommend removing the HEI module completely out of the distributor, then using the MAG + & MAG - wires on your new Safeguard to connect to the pickup coil in the distributor. The coil wiring is easy on the HEI, it's just a quick connect on the cap.
I'll go over the wires in the round connector on your current dizzy but I still suggest not using it, the Safeguard is quicker and has more spark energy alone.
Four wires in the round connector: green, white, black, brown.
The green wire is the H pin on the HEI module and is also connected to the small green pickup coil wire.
The white wire is the L pin on HEI module and is also connected to the small white pickup coil wire.
The black wire is D pin on HEI module
The brown wire is the ground.
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