I think alot of the disparity in the quarter mile numbers come down to two things. #1 the particular motor, most off the assembly line weren't within 1 point of advertised compression, the set of heads,(valve job and port alinement. The cams installed centerline. The distributor setup.
The stars could aline correctly and you had a real firebreather or you could get a dog.
#2 the driver, most didn't know how to launch a car with limited traction.

When will this car actually go down the track?

the xe262 under cams the engine. 4.10's way over gear. 10.5:1 will never run on pump gas. I had a 9.3:1 engine with a 268/276 comp magnum replacement and it blew 195psi; really too high for reliable pump gas operation. i'd re-think the combo.

it has 3.23 gear right now if i remember reading correctly, run the car down the track with those gears.

Man, I don't know how many miles I rode (and occasionally drove) in my buddy's '71 Sport Satellite in the '80's... Your post brought up a lot of memories!

Honest answer to the question, about fifteen flat after a bit of practice. With sharp tuning and lots of seat time, somewhere in the fourteens in decent conditions.

Real world performance for an OG musclecar...

If you're still planning/buying... I'd consider more cam, maybe a little less CR. Especially with a craptacular stock 906 open combustion chamber - prone to ping.

That cam you mention would be a good street cam for a 8:1 318, IMO you would leave a LOT on the table running a tiny cam with 440". More duration would help with moving that torque curve to the right (4.10's will be very short with that 262 cam).

"But what about low end torque?"

What'cha going to do with all that low end torque from a big block? Hook up on those T/A's? Puh-leeeeze. Yeah, guys *have* got cars to launch on hard tires, but often with light torsion bars,shocks, etc... you know, all the stuff that makes a car a turd to drive on the street. And you mentioned T bars, AC, PS, iron manifolds, etc. This is probably a super nice car to roll in. And the very things that make it so good for that work against ya' at the track...

If it's already built... put some 2.54's in it and be the burnout KING! All joking aside, I would think seriously about keeping the 3.23 gears.

Oh, and like was mentioned by others, might wanna check that cranking pressure... octane may be an issue.