They are kinda close, so if that's what you want then go for it.
The E core coils put out an average of 4-5k volts more energy than the Blaster series round coils.
I seriously doubt you cold ever tell the difference.
Thanks for the reply. I was thinking purely from an ease of installation standpoint since they would simply install in the same location as the coil I have now. Then, I started looking and found these epoxy-filled canister coils that have anywhere from .3-.7 ohms primary resistance. They even have 45,000 max voltage. Since I don't know a whole lot about coils and their specs, I'm wondering if one of these would be equivalent to a e-core style coil. Are there any other specs to be concerned with beside primary resistance and max voltage? Would either of these contradict the point of going with HEI in the first place?