Thanks for the reply. in terms of price I'm willing to spend a fair bit if the benefit is worth the cost.. The main thing is that in order to qualify for the vintage car race my 240 can only have period modifications. The class I would be entering it as would be 1970-1980, so upgrading to a modern aftermarket system wouldn't be allowed.
Its kinda odd that they don't list much in terms of specs for the coil, but I did find them on another site: http://www.autoanything.com/ignition-systems/74A6547A0A0.aspx
From what I know the engine was balanced and blueprinted. It has a E31 head, 280duration cam with .506 gross lift, stronger valve springs, and triple weber carbs... So not exactly stock.
From the research I've done with that cam the max power should be around 7600rpm..The tach may not be 100% accurate, but it doesn't jump around at all so I'm sure its fairly accurate, and I really don't want to go aftermarket. I like the original look, and thats one thing I don't want to sacrifice.
The highest I've ever reved it to was around 7800rpm, but only because some douchbag didn't feel like letting me merge, so I had to put the hammer down.
The Pertronix kit I mentioned converts the stock distributor to electronic ignition, so it wouldn't be obvious to the scrutineers, but I'm not sure how good it is, or if it would work well with my coil. The other option is going for the ZX electronic ignition, but that requires a bit of extra work to get the tach to work.. I don't mind doing the extra work, but only if it will give me better performance.. Somehow I doubt 30 year old technology will be any better, but some people swear by them.
Heres the Pertronix kit I mentioned. I've seen it on several online Z shops, so it seems to be a pretty common mod: http://www.thezstore.com/page/TZS/PROD/12-4020
I did come across this: http://www.classiczcars.com/photopost/member-galleries/p7065-ultimate-ignition-setup-3f.html
It wouldn't qualify for the race, but maybe if I came up with an easy way to intall and uninstall I could use that with my existing setup and just remove it for the one time a year I'll actually race it.
I dunno, maybe I'm just over complicating things, But I really don't know much about ignition systems and I don't want to start throwing stuff together with no idea whether it will actually work properly