360 swap power issue

Hey guys so about a month ago i swapped a 360 into my 66 cuda and pulled out the salnt 6. Now here is the issue whenever i rev my engine or even drive it for a bit i loose my signal lights and the alternator gauge goes past the c on the gauge. i have swapped a new alternator and it is still doing the same thing is there anything that yous guys think it could be.

Thanks