HEI in Mopar ECU casing

Well, do you think the heatsink I have will be enough by itself? Its 1/8 thick aluminum. And is about 3/4 the size of the front of the original mopar box. Look previously in this post for pics of it, only I ended up using just the one piece instead of stacking. The 2..

Of course it will be enough.
The ones I use in my HEI kits are only exactly as big as the ECU and 1/8 thick and never had a failure.
Gotta keep in mind that these things ran at 200+ degrees all day long inside the distributors.