It sounds like something is weak in the ignition. From what you're saying it only happens under load. I've seen this happen with bad plug wires on a car or a bad plug. Since you're backfireing out of the stack, I'd say for one reason or another, your ignition is cutting out, and allowing unburned fuel to enter the exhaust. Then when it fires again, all that fuel is ignited causing your backfire. I'd start with a general tuneup. Go for points and condenser first and inspect your cap. You may have some bad plugs or even the wrong plugs, or maybe some bad plug wires. I remember when I was on here years ago, seems like some guys were putting in resistor plugs and causing ignition issues. I remember it's important to get the right plugs and plugwires on it.
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