The "ready to run" distributor doesn't have any features like a rev-limiter, ignition retard during starting or dynamic dwell. But it will make a big difference in how your motor starts & runs. The multi-spark distributors will not work with the oem tach unless you use their tach adapter module, which costs extra.
I say use the "ready to run" type distributor because its quick, easy and inexpensive. If you want a more involved installation step up to a distributorless ignition.
-G
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