[A Snake]

Paul,

It depends on your compression ratio. Any plug that will fit the older head physically will work, as long as you select the heat range for your compression.

If memory serves, most of them were 11:1. If yours is, then the Autolite BF32 (old number) will be fine. Have your parts house cross reference the number unless they have an old book. I'm sorry to say I don't know the new numbering system.

If your engine is a little fat (rich), you probably need to lean out the idle. Pretty simple with a Holley. Just close the idle screws (one on each side of the front metering block) back them each out one full turn and fire up the engine. work one side at a time. Adjust in or out and go for the highest rpm idle you can get with each screw. When you have done both sides, you can "play with it" to fine tune. May need a little more open on the curb idle. Make sure the curb idle screw on the throttle arm is not already too far open when you start setting the mixture.

With stock cam, compression etc. it should idle at 750rpm, with just a little hint of cam lope.

Hope this helps a little.

Al