Holley Street Avenger 570 Idling Problems

That cam, installed correctly, should idle easily at 700-750 in P/N and 650-700 in gear. It's only 218 at .050. Barely larger than a stock camshaft.

Timing dropping out when in gear. Would seem odd with such a mellow cam as idle rpm should be well below any mechanical advance coming in. If it won't idle at those level, look at vacuum leaks and fuel dripping in the carb boosters. Exhaust should not smell like a fuel truck dumping gasoline!

Carb could have some bad surfaces allowing cross over issues on main body and metering blocks, etc.