which would be better?

On my 240z the PO put in the XR 3000 Electronic Ignition System with the L24 engine. That engine is now toast and I plan on putting in a 280z engine. Would I be better off using the 280z distributor or stay with the electronic ignition from the 240z ( using same distrib. as l24) for best performance?

One other question, in that L24 engine it had the E88 head with a Isky racing cam, don't have specs atm but would that fit into the 280z head? I don't know what head it is yet, getting engine tomorrow. So is the cam size the same in the heads so it would simply replace the stock one? I don't know much about cams so any help would be great. I can probably get the exact cam and specs later if needed.

Thanks for the help