WOULD THIS 100 amp alternator work

The amp meters on the early cars are a direct feed from the charging system so everything your car is getting has to run through the amp gauge first.
It can either melt down or get carboned up and not pass enough voltage to run everything. If it melts down you in the least fry the wires and circuit boards under the dash and at the worst burn down the whole car.
If it gets carboned up the gauge stops working and things like your turn signals, radio, and ignition wont get the voltage they need to work right.
You in the least need to run the heavy jumper wire from the alt to the battery and that will take about half the load off the gauge so you don't fry it or the rest of the puny wiring these cars came with.
I converted my Dart to a true old school 100 amp cop alternator and I have never done the jumpers or anything but it will regularly completely bury the gauge and the hot wire going to it gets real warm, I can also jump start a D9 cat with it but I do need to do the bypass and other mods to safety it up sometime. I don't drive it anymore and kept an eye on the wiring and stuff when I did, but I also didn't drive it very far every day and kept the battery charged so it wasn't always dumping 100 amps or more through everything.
I did convert it all to electronic ignition and charging system and also found out that the later voltage regulators with the little hump/bump in the middle of the housing work better with the big alt, the earlier ones always had issues and tended to overcharge which is bad with over 100 amps.
If you decide to upgrade do at least the jumper and other mods, the gauge will only read about half of what the system is really putting out if you leave it hooked up.