Here is what you need, and it didn't come off the desk from a philosopher, it came from a hands-on application with a LOT of experience in maintaining and running a pair of 427 motors on Lake Erie. I took the advice and got the wires for my boat, and I think the advice is sound.
Check out these threads, and the copied post below from Tim Toth, who still holds the record for the nicest looking original 427 marine motors, and also the nicest starting motors I've experienced. Yes, I know there are others, but I adequately qualified my statement, lol.
One thing is for sure: If you use the recommended wires, you will eliminate plug wires from being a potential problem with the performance of your motors.
Regards, and good luck.
Previous posting from Tim:
I purchase my caps and rotors from Summit Racing / 3 locations/ Las Vegas , Atlanta or Tallmadge , Ohio. 1-800-230-3030 .
The plug wires I purchase from Splitfire direct ,( Old World Industries ) . 1-800-477-5847 , part # ws-8100 , they are out of inventory stock at present but will place your order and ship direct to you .
The wire set`s are a direct bolt on , no modification needed but the dist cap ends are 90 degree instead of straight , just rotate the position for clearance .
What are the ohm readings of your plug wires at present ?
If you are not getting spark to various cylinders you may have a BAD plug also .
Tim / Sandusky , Oh"