1975 360 bottom end power

Your intake and carb seem decent, unless the carb isn't tuned very well.

I am not sure how the 75 distributors are, I switched from points to a Mopar Performance distributor which is probably similar to the 75 except maybe for the mechanical advance. You need to set the initial at 18-20 then check the total mechanical to see where your at.

And again, get a better cam... :)