500+ci Builder

I joined this forum because I'm at wits end trying to find a builder that can build to my performance requirements, within a few boundary's, and of course budget. Now I know many of you are going to laugh at my performance requirements as they are relatively low and there in lies the rub. Most builders are accustom to building for maximum output and, I believe, they simply don't know how to throttle things down and work within a small budget.
In my case, I'm wanting a street motor, 500+ci, capable of producing 600tq at 3200rpm and holding it for a minimum of 1000rpm. HP is relatively mild at 1 to 1.1 hp per ci with maximum hp developed inside of 5500rpm. Motor should be able to rev safety to 6000rpm. I consider these attributes to define a low RPM motor. The only boundaries I'm setting are a minimum of 10" of vacuum, hydraulic lifters, maximum converter need at 3000, B body oil pan, straight spark plug angle, maximum 93 octane, aluminum heads and if possible a dual plane manifold. This criteria really is defining a low maintenance motor with and a friendly behavior. Finally, completed within a $8500 budget. I don't really care if the block is B or RB.
Most of the time I'm finding that the builders are wanting to overbuild, and/or using premium components which are at odds with my budget. I have found one builder that can do the build but it would sure be nice to have a few to pick from just to keep things honest. I should say a couple were within $1500 but the majority were over 11K.
Motor must be a complete running motor which I get to personally be present for the tuning and pulls. Of the 10 builders I've talked to, two were unwilling to deliver a dyno sheet or allow me to be present for the running (I found that very odd as most were welcoming to my presents).
As you notice, I do not place demands on components nor their specifications but I do request a detailed list of components manufacturers as I do not want any low quality oddball stuff being used unless they can vouch for its integrity.

Am I being to unrealistic?

BTW, if any of you builders have a recipe for a motor that would meet my needs let me know as I would like to compare it with my own personal formula.

Many thanks for your replies.

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