Sorry it took so long to reply. Actually, I haven't installed it on the car yet. The car is getting k member swap, engine swap, disc brakes at that time. I will say it is beautiful, I guess I could unbox it and get some pictures. I was more impressed with their description of the difference of...
I have used Thermoquads on everything that I drive from 1975 on. I have never bought an Edelbrock and never will. I bought a new Holley spreadbore back about that time, used it for a couple months and went back to Thermoquads. Still have it hanging on my wall. Probably doesn't have more than...
If you are going to buy an Edelbrock, get the AVS2 and not the Performer. Can you post a few pictures of your Holley, so we can see what you have. Take a couple of the driver side-the throttle-kickdown linkages. Them spreadbore Holleys are good carbs. If you have the one with the Chrysler...
Mortske is a GM guy. Early on, he didn't know anything about Mopar kickdown linkage and the importance of it. All these You Tubers use Edelbrocks because they can buy them at there local O'Reilly's, then they have to use the adapter. If your Holley 4175 is the Mopar model with the Chrysler...
Many times when the fan motor pulls a little hard, it will overheat the fan switch plugin and the switch. you will be able to see that it's melted somewhat. You need to find a good pigtail and a new fan switch.
In 1971 they went to part throttle kickdown, if you install a 1970 trans you won't have that, not the end of the world, but it is nice to have. A & A Transmission has a kit to add to the 70 and earlier transmission.
Check the kickdown lever on the transmission. If they are different lengths, use the one from your Polara. A body uses the 3 rod bellcrank kickdown system with the shorter lever. C bodies usually use the 1 rod system with the longer lever. If you use the wrong lever the ratio won't be right. So...