Spark Plugs

[mikes67]

Hey Folks! mikes67 back after a little absence. Really need some help. Just got through doing some major tuning on the 402BBC and went through the 750 holley but the thing keeps falling on its nose at 5400 to 5500. Mechanic suggested changing to a hotter plug so i went from the R44XLS ACDelco that was in it to a #5 plug and the car sounds like 3 of the plug wires were left off. I'm going to put the engine specs below because I know someone of you gearheads is going to ask and I want the best help i can get.

396 + .30 = 402CID
540 lift hydraulic cam
10 to 1 compression (.250 dome pistons)
Edelbrock Aluminum Heads
(Performer RPM RECT. Port 6055)
Edelbrock Air Gap Intake
750 Holley