273 Compression Test Results

I found this thread on FABO http://www.forabodiesonly.com/mopar/showthread.php?t=69190

Which provides this link for 273 head gaskets
http://www.summitracing.com/parts/FEL-521SD/

But if you read to the end of the thread, the bore on those gaskets is 4.18" so it looks like you may be right. Another poster computes that this extra volume decreases compression by only 1%.

The OP on that thread also states that 140-150 PSI is "acceptable" and 120-125 PSI is "tolerable". By his standards my engine is tired.