Spark plug issues 1950 dodge coronet 230 3.8l 6v gyromatic

Hello to all.. I'm new to this, user name is ownly1 and I just wanted to say that I've read multiple threads regarding the vehicle I own (which is a 1950 dodge coronet gyromatic). And the people here who post seem very knowledgable and helpful.

The issue I'm having which is lots with this car but one at the moment is my spark plugs. I'm having difficulties believing the ones I'm about to replace are the ones meant for my car. They are an ac46. When I go to the parts store they of coarse don't have those particular ones in stock and when the do pull their list up none of them seem to match the ac46 in dimensions, basically if the plug were to be seated on the valve cover their depths are much deeper or longer then what the ac46 depth.

So others out there with the same engine type again which is a 3.8l 230 flathead dodge, please help me so I can put the correct type of plug in my car and also the spacing would be helpful..

As of yet I don't have a shop manual for this car.

I was running Champion RJ12C for about 2 years with no problems.

I replaced them last month with Autolite #306 as I could not find the Champions locally at a decent price.

Found the Autolites on line, BTW

Regards,

Frank