I have been using the carb lift plates for years on FEs, with absolutely zero issues. Usually with the heavy steel Lakewood scattershield , clutch and flywheel all installed. And thats while using a 50+ year old Ford Sidewinder intake manifold. One time, just for fun, I removed 2 of the carb nuts while the engine was being held up in the air with the lift plate, nothing happened. If 2 carb studs are adequate , 4 is almost "over kill".