New Cam Same Power

First off welcome to the forum its nice to have you!
What you are experiencing is a classic case of too much cam! Your cylinder pressure of 100psi is right on mark with a low compression stock well used 318. Iv owned a bunch of them I know all to well lol. That cam is probably to much cam for a mild 9:1 360. Your probably at 7.5 to 8:1 but there is stuff that you can do. Without changing gears or converters. Timing is gonna be your friend. @318willrun is running 20 initial and like 40 total in his 318 with low compression you can get alot more than 12-14 . We can work on the tune and get some more out of it. But don't expect a whole lot
More than what you begain with. When I first started my 318 build alot of members told me start with getting a tight sealing engine before worrying about cam and bolt on stuff. They are right. A good hone and ring job (depending on the shape of your cylinders) and a valve job make sure they are sealing can go a long way on a budget 318. You can't afford to loose any more compression due to a leaky valve or ring! Recheck all your cylinders with the throttle Wide open. Then report back if they are above 100 and consistent then chances are you have don't have any broken rings or bad valves. We can raise your compression a little with some thin headgaskets, do you know what gaskets your using now? After we determine all that we can work on tuning your carb and timing.