Congratulations on the new car. Get ready for a wild ride in more ways than one
IMHO, Streetability is more a thing of taste. What I think is "streetable" may be totally different then what you or others think. On the motor that I am putting the finishing touches on right now, I was thinking about things like streetability, reliability, minimal maintenance and found that these characteristics were in conflict with other characteristics that I wanted, like amazing power, and through the roof torque and high rpms. So I chose to go somewhere in the middle. And then somewhere in all of that, sooner or later the owner has to think about $$$$$$. I always tell people that I'm not rich enough to not have to ask "how much?" On my motor I chose a hydralic cam and lifters simply because I didn't want to deal with the occasional adjustments that come along with a solid cam. I also chose lower pressure valve springs in hopes that I might get more longevity out of the valvetrain. I also went with a flat tappet cam and consider that more of a cost saving benefit.
I'm not familiar with the procomp cylinder heads. I chose the Edelbrock 2V heads and then had them CNC ported since my motor is a 393. I was surprised to see the lower compression ratio on your setup since the KB876 pistons are a flat top and your motor is stroked. I'm assuming those heads have a bigger combustion chamber. Maybe mid 70's cc like the stock open chamber iron heads.
There was only really one thing that I noticed from the list that caused me concern. With boring the block 40 over, I would have liked for the engine builder to have sonic checked the block. I happen to have a sonic checker so even though my machinist didn't have the ability to check the cylinder wall thickness I was able to before and after machining. It sounds like your motor will spend the majority of it's life on the street so I really wouldn't concern myself with it at all.
Is it a high quality build? Well, does is run like scalded ape. It should!! The components of the build are fine. What I have found is the build quality usually comes down to one thing; the engine builder. If they took there time, made precise measurements on every item in the motor, started it and broke it in properly, then more than likely you have a quality build. Remember, the best measurement of all is when you crank it up, does it create a smile from ear to ear that is impossible to remove. If that's the case....welcome to Pantera ownership!! Now go drive the hell out of it!!!
Chance