desperatly need engine help

I don't think that cam is that bad. We put a .508 cam in a nearly stock 318 and with a fairly loose converter and a 750 VS Holley it performed quite well. I think you'll find if you put a larger carb on it a lot of your issues will go away. Assuming it doesn't have any mechanical problems from the previous blunder. You may need a looser converter though. That really helps it idle in gear.

Additionally you may need to drill the carb butterflies to get enough air flow. What happens is guys keep cranking the idle screw down until the butterflies are passed the transfer slots. Then the carb isn't running on the idle circuit, it's running on the main metering system causing all kinds of idle problems.

I would also recommend a Holley with down leg boosters instead of those crappy straight leg ones that come in most of the carbs. They're fine for a stock engine but I've never been able to make them work well with a modified engine where the vacuum signal isn't as strong.