Think I spun a bearing - rebuild time. Need advise.

[EvanZR1]

Well, looks like I'm going to accelerate my mod plans. Was backing the Z out of the garage tonight for date night with the wife, and it started knocking, blowing white smoke and threw a low coolant light. Car had been running fine last weekend, but I had been hammering on it pretty hard. Given that I don't really know history on the engine, how it was driven, and the fact that it's got 100K miles on it, I can't be too upset. The question now is what to do, and who to take it to. Obviously we'll need to get into it before making final decisions, but here's what I'm thinking.

Option 1: Rebuild keeping stock displacement. Do full porting (top end & heads) and long tube headers. Maybe go ahead and do cams as well, would like feedback from those that have done cams on stock displacement. Would love to have a motor that could rev to 7500-8000 rpm.

Option 2: Go big. I know Haibeck lists a 415 CID, but I've seen some posts of people going even larger. What are the experiences of those that have done this, both for power and reliability? How does it impact the ability of the motor to rev past 7K?

Of course, cost is going to be a factor (don't have a huge money tree in the back yard ), but I want to do it right and plan on keeping the car for a long time once this is done.

For the work, I'm thinking either Corey Henderson or Haibeck. Since I'm in Dallas, Corey is definitely closer and a LOT easier to get to. However, while I've used him for tuning in the past and I know he does a great job with porting and tuning, what's the experience been from those that have used him for rebuilds? Obviously Haibeck has a great reputation, but would be a pretty big pain in the *** to haul the car all the way up there. Having said that, I only plan on building it once, so I don't mind the effort to get the best. Any other options/recommendations? There are a few other things I will want to get addressed while doing this (AC needs troubleshooting, want to have the seat motors rebuilt, install a custom stereo system and lower the car), so don't know if that might impact recommendations as to who to use.

Thanks in advance for advice.