Robin,
I have to admit I missed the coil spring aspect, but if you look and the rear boot, it is a long boot that would ID this car as an early Ace I believe. Also, in a picture I did not post, the nose has the AC emblem with 2 holes below it that make it look like it was originally a Bristol car. Based on your catch of the coil sprung front suspension, the frame may be also be modified at the front or maybe this a FrankenAce made from a couple of cars?
Jay