The lamps pull alot more power. I installed them in my 68 too. I have same response at idle. BUT, they will burn out you headlamp switch. I burned out two before I figured what was wrong. Now, I have a relay between switch and lamps. So that the power to the lamps doesn't come through the switch.
I have had mine in for 8 years or so now. They sure are brighter then originals.
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