[Dwight]

I have driven several of Keith's big block motor is buddies Cobras.

One a 428 stroked to 461 @ 601 hp and 620 Tq(I think 620 Tq). Keith's street motor always make more Tq than hp. And all the motors I have seen make more HP / TQ than he advertiser. But again it's hard to tell 20 - 30 hp different on the street. Well my butt can tell.

Another Pond aluminum 481, 630 hp ranges more Tq. (close to 640 I think)

A 427 s.o. bored & stroked to 487 c.i. 618 hp and 632 tq.
I have driven these three Cobras a lot on the street.

I cannot tell the different in the weight.

All have tons of low end torque and will spin the tires (good tires not T/A radials) in third if you want to.
All have very good street manners. Easy to drive in town.

For the money, I would buy a production block 482
I would ask Keith to bump the cam up a little for more hp.
Just my opinion

Dwight