Collector flange size for 79 318 exhaust manifolds?

[Andre68]

A buddy of mine gave me a free set of exhaust manifolds of his 79 truck.

I put them on my 318 and they fit fine except for the drivers side, had to do some grinding to get it to clear the steering box nicely.

I need the collector flange size so I can install exhaust pipes to them.

I was wondering if anyone knew the size for that? Thanks

Car is a 68 dart

 

[krazykuda]

You couldn't measure it before you installed them?

I don't have any of that series to help, sorry.

Can you measure them in the car?

 

[Andre68]

im sure i could measure them. Do I just measure from 1 bolt hole to the other? or diameter of the exhaust hole?