Cylinder has spark but not firing..

And yes I've had this motor apart in 3 different situations. It's been kind of an experiment just to see out of curiosity. For example I wanted to know what would happen if you ran a solid cam on a hydraulic lifter. It actually worked but decided to switch to a stock cam. I've had the heads redone so I pulled the old heads and put the j heads on. I've had to take the intake off twice alone because of vacuum leaks. Then i tried running the motor with the stock 318 torque converter. That doesn't work because the 360 is externally balanced and I didn't have weights on the converter. So now I'm at this and I'm still learning. I've just never had this problem before. Gonna try converting to electronic ignition tomorrow and see what happens

Do you have a factory service manual?
That would be your next thing to buy.
Seeing that you have ''experimented'' a lot with this engine, it's no wonder that you are having problems with it.
The running a hydraulic lifter on a solid cam experiment and pulling the intake off twice because of vacuum leaks speaks volumes to me that you don't know what you're doing.
I bet that your problem is a mechanical one, and it is probably the cam, lifters, push rods, or rockers are mis matched, installed incorrectly, or worn out.
You must have stock in a gasket company or something........lol