340 heads or gasket leaking?

Hello,

I have a 73 340 installed in my 65 dart. It is a low compression motor .030 rebuilt with headers, airgap intake and a 242/248 cam. The heads are from an earlier 340 with 2.02 intake valves and little porting (got a good deal on them).

I did a compression test and all the cylinders are all in the 130-135 psi range with very little variation.

The motor runs good, no issues other than condensate coming out of one of the pipe. There is no H or X connectors, each bank runs independently to the back.

So, when the engine is at the operating temperature there is a quite a bit of water coming out of one of the tailpipe but not the other. First time I thought it is just condensate, but when the engine is hot.....????
There is no contamination of the oil or coolant whatsoever.

What can it be? Is it normal?

Thank you.