need a six

That's simply not possible. These engines do not ever blow up if you believe popular mythology.

Seriously, a couple bits of advice....

1. People nearly give these engines away, so don't pay more than a couple hundred for one.

2. Later engines after 1983 or so use hydraulic lifters so you no longer have to adjust the valves and they also use the sparkplug wires that don't require the seals.

Good luck...