Head gasket sizing?

[1BAD68]

After 3 years it finally dawned on me that I might have been running the wrong head gaskets  
I have a .030 over bore 318 with a 4" stroker kit.
Lately my engine has a coolant leak from one of the heads and some coolant is coming out of the exhaust.
So late last night started thinking about the head gaskets I used when assembling the engine and sure enough after looking through my receipts I found that I ordered a standard 273/318 Felpro gasket kit. Would a stock head gasket for a 3.91 bore be too small for a 3.94 bore?
What size head gaskets should I get and what other symptoms would I have had running them too small besides a blown gasket?

[firefighter3931]

I'm not familiar with smallblocks but as far as head gasket sizing ; as long as the fire ring doesn't hang into the bore or combustion chamber on the cylinder head you're good to go. 



Ron