Rear brake upgrade (again, lol), Or,how to get a vented rotor Options

[HalfMoon]

So I know this has been talked to death thousands of times and when I do a google search there's reems of information, but rather than spend the entire evening reading through many posts that really aren't relevant, I thought I would pose the question and see what turns up.
Recently I had a four wheel alignment and corner balance done by a really great and well known shop out my way (who are very familiar with track cars for my local track-Summit Point) and when I asked the primary mechanic today what things he might suggest for my sbc Sheridan standard wide-body conversion, he said upgrading my rear brakes would be pretty important for that track.
Soooo, yes there are lots of ways to go to be sure but I was wondering about retaining the standard rear 914 brake (and e-brake) but using the vented 911 SC rotor? Do I recall Eric made/makes a spacer for this or is/was that for converting 914 fronts to rears?
A lil confused this particular application.
I like the idea of retaining the stock 914 rear calipers if I can but I really want to go to vented rotor (as opposed to drilled).
Thoughts?

[Dave_Darling]

Ask the mechanic why he recommends upgraded rear brakes. Is there some specific thing that he feels should be remedied on your car at that track? Does the car need more rear brake bias, more rear brake effect, more rear brake heat dissipation, or something else?

--DD

[HalfMoon]

Ask the mechanic why he recommends upgraded rear brakes. Is there some specific thing that he feels should be remedied on your car at that track? Does the car need more rear brake bias, more rear brake effect, more rear brake heat dissipation, or something else?

--DD

Good question!
The main circuit at SP has only 10 turns but many high speed straights, the secondary circuit (one that's a bit slower but better for my level) has 27 turns!
I think my mechanic was concerned that my car having a sbc and carrying more weight (2380 dry) that I may experience some significant brake fade. On the main circuit there's plenty of run off but on the secondary there's walls.
As an aside, PO removed the valve.
Oh, corner weighted at 490 front both, 700 rear both.
I think the main concern is brake fading due to heat buildup on the stock solid rear rotor. This is a mechanic well known for his tuning to this track and he reports, 914's that are well modified have experienced this problem at SP.
I guess I'm wondering if a standard vented, drilled vented, or cross drilled vented is what I want to do. I hear drilled vented rotors have been known to spider crack with alot of oscillations in heat.
As for the caliper, I'd like to keep the stock teener rears if I can. I guess that'll be a wait and see thing.