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I think the ex manifolds are a bigger restriction to power than the stock converter, my 68 318 2bbl would stall the factory converter to 2100 RPM, I bet the 360 mag can make it stall a little higher. Those manifolds have some really tiny passages to force all that exhaust out of.

It's true,the manifolds will hurt HP more than a torque converter. The converter will hurt more in the ET slip. I ran the loose 3.9 converter behind a 360 magnum,it didn't become something it's not,still a low stall junker. Swapped converters and picked up .3. It's not hard to do,you just have to make lot's of laps down the track in different configurations to see.The Dakota weights 3500 with the new owner.