290@050 is way too big for your combination. That cam is killing the torque and slowing you down. Sometimes bigger is not better. I think the 292 street roller would work or you could go one size bigger with a 260@050 intake lobe.

Looks like you're crossing the stripe at roughly 7000 rpm with those gears. With a better cam you should be going faster so you most likely will need to drop the rear gear down to 4.56 or even a 4.30.

A 440 with ported EZ heads and 12:1 compression should make 650 to 700 hp if you have a good intake manifold. That would put you into the low 9's at 140+ mph if the chassis is decent. So I'd gear the car to go 7000 rpm at 145 and then pick a cam that puts peak power around 6800 rpm. 260 @ 050 should be in the ballpark. Probably need 5000+ stall on the converter but I'm no expert there.