The switch you pointed to is not a stock switch because it has 5 terminals including one for a starter solenoid which our generation of old trucks...
If you are looking for engine (or ignition) parts, specify the year that the 400 Chevy V8 is from. Distributor parts (points and condenser) for...
A dwell meter will work, no matter what the timing is set to. Engine might (probably won't) run because of the timing, but the dwell can be set....
Separate names with a comma.