Ha. I knew I had forgot to let you look for a heat sink. I'll go through the box and see what I find that would fit in the original case. The best thing to do would be to use the case as the heat sink but to do that and keep it stock looking would be the challenge. One might be able to tig some studs inside for the HEI to mount to... ?
LOL, yeah I forgot all about that too. There is a couple things that stick up that you can bolt to (opposite of a stud, having brain lapse right can't think of its name, haha), that's what I bolted my current heat sink to, it seems to work ok. I used 1/4 plate steel, I really don't know how much heat it carries a way as opposed to aluminum though. The thing about welding or JB welding studs in would be you would need the module to be able to sit directly on the box, and not have an air gap, that would be the toughest part. The aluminum isn't that thick so drilling and tapping is out (unless you drill though, bolt and nut it). I'll see if my set up is sufficient in the long run, I may have to come up with a better method, I'm up to suggestions too.
I have a couple other ideas too, but of course that would require special tools that everyone may not have access to(trying to keep it "poor mans hei"
).