Under Hood Wiring Harness - 67 GTX

I am ordering a new under hood wiring harness from Year One and the options were as original, or as original with modifications for the three wire alternator and electronic ignition. Also ordering the dash wiring harness. It indicated the electronic ignition modification was for the Mopar electronic ignition, and if you had any other electronic ignition setup, it was recommended that you buy the as original harness and modify it. I believe my electronic ignition modification is a Pertronix. I would like to have under hood wiring with no mods and have no problems with going to the Mopar electronic ignition if necessary. Is the Mopar electronic ignition wiring any different than the Pertronix? Is the Mopar electronic ignition a good system? Does the Mopar support operation of the factory tach?

Also, should I ensure my three wire alternator is as close to the original in output to make sure the amp meter wiring does not melt the firewall block again. My car is an original AC car and I believe the original alternator was only 48 amps. I am not sure you can buy anything under 60 amp these days, but the car has no mods such as lighting or stereo that should require anymore than the original draw. Is bigger better when replacing the alternator, or is going bigger just creating more possibility of a failure in a known weak leak in the firewall connector block or amp meter wiring?

Thanks!

Don

Hey Don,
im not positive about the differences between the MP and Petronix Elec. Ign. to comment, but I will say the MP system is a good one and is a complete dizzy kit, where as (depending on which Petronix kit you have) mods the orig dizzy with a pick up.
Stock, the 67 GTX had a dual point dizzy and the "square back" alt, which I believe was a 60amp unit IIRC
BUT NAPA sells several brands of 35/46amp regulators.
As far as the tach goes any dizzy can be used with any tach, but since you don't want to mod the harness at all, I can say that MOST mopars that came originally equipped with Elec. Ign., had a tach provision, but again, I don't recall if the MP kit has a tach provision, I would ASSUME it does.