Slow cuda 68 help plz

That's a big cam for a mostly stock 318. You should have at least 9.0:1 compression. But that wouldn't explain the dropoff in performance. I wonder if your tuning is correct. What is the timing set at? What jets do you have in the carb? Do you have headers (how is the exhaust set up)?

How was the cam installed? Straight up? degreed?