When in doubt-bore it out!
You can go to your local pine tree air freshener and oli change parts store and buy a DIY at home radiator test kit to see if you have exhaust gases mixing with your coolant. But given that you are losing coolant and producing steam out the pipe, it's highly likely burning water in the combustion chambers.
That being said.
One of three things is most likely going on in order of oh shit factor.
1) Bad head gasket
2) cracked or corroded head passages
3) cracked block
At this point you could try and torque check the head to 52lbs, but unless some idiot built the motor and never did the final torque sequence, not gonna do much for you.
Removing and reinstalling the head is fairly straight forward and can be done in an afternoon for the novice. However, if your head is cracked you may not know from just looking at it. If your passages are eroded away and the cause it will appear more easily with the head gasket material showing evidence of failure at the spot of the metal that has turned to chalk.
At this point I will defer to others to guide you down the road of what to do given your financial means.
Might be time for that eruo spec high comp build plus side drafts. Blunt is selling 90mm 10:1 pistons for $500 right now.
but what do I know.