Technical anyone know what oil caps/ breather fits these old covers

Can't seem to find a oil cap to fit these anyone know of any?

 

Stock Ford, I think that MOPAR used some like that as well.

 

I got a Mr gasket one but it's to wide it hits the fins. Guess I'll try a stock one. I would like to run a breather on one tho

 

Try an older style GM grommet. Then use a push in breather.

 

Got a set on my OT Warlock. The take a twist in breather/cap. You may have to make a thicker gasket. I did.

 

I used Edelbrock Twist ins. Like I said, Double up or make thicker gaskets.

 

Tried that and it leaked real bad

 

I'll have to try that with that cap the one I have to to short to do that

 

Speedway used to have small dia. twist in breather caps....
dave

 

I'm wanting to put these on later model 351w heads with roller rockers, will I need spacers?