Ok 63 Nova Wagon, should be about 3200 lb including driver, gas, tools, and maybe a dog bed.

The Isky was slightly stronger over all though it may have a rougher idle. I put the engine above in your car, 2" duals, and here we go. This is at sea level, so up in Reno it will go slower:
Torq 285 at 4300
Powr 294 at 5900
Shifting at 6000, again kinda high unless set up for it
2.16 60ft
9.21 at 75.8 1/8 mi
14.34 at 96.80

I also Gonkulated a 292-30-over, everything else same:
Torq 331 at 3800
Powr 312 at 5500 also really high for a stock 292
2.10
9.00 at 78.1
14.00 at 97.8
The 292 is faster of course, but with all those gears it's not too much advantage and about 40 lb heavier.

My test mule is a powerglide car (very consistent launches with a 3.08 gear LOL), and the 292 makes a huge difference with that tall gear. You've got a steep enough gear that it's not that different. As Panic pointed out it will idle better, peak lower, but then again it better because the 292 doesn't like revs.

I have a stock 292, but I'm not sure I would dare ever go over 5000 with it. That's probably extra safe, but that's how I keep my budget low!