Ok, so it's new to me.

Heavily modded exterior, stock engine and tranny with just under 26k original miles.

I getting a loss of power and backfiring whenever I need power to climb even a slight hill at any speed, any gear. No issues with idling or downhill.

It has the stock Holley 1920 carb on it. I took it off and cleaned it but found it to be surprisingly clean already. I've read that the 1920 floats become unusable over the years and that I have pretty much zero chance of finding a replacement but that the Holley 1945 is a suitable sub.

Help?

-Oz