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Old 04-14-2011, 05:32 AM
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SSedan64 SSedan64 is offline
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A few ??'s.
What HP/TQ are you hoping for?
Does the Jag IRS have 2.88 gears? If so an OD Trans may not be needed.
OD Trans ratios:
Trans--------1st-----2nd-----3rd----4th Gear
TH200-4R----2.74---1.57----1.00----0.67
TH700-R4----3.06---1.62--- 1.00----0.70
4L80E--------2.43---1.49---1.00----0.75

I'd shy away from ProComp Roller Lifters & Rockers. Some of their Aluminum Heads are Ok, the ones with larger 215cc or so Intake runners.

These are 2 SBC406 builds ChevyHiPerformance did a while back. Very torqy builds. Either of these with a nice Roller Cam would produce much more HP/TQ than these Flat Tappet builds below.
The Impersonator I, w/Vortec Heads.
http://www.chevyhiperformance.com/te...que/index.html

The Impersonator II, w/Aluminum heads.
http://www.chevyhiperformance.com/te...ild/index.html

I was going to suggest an old Aluminum GM 70-72 LT1 type Intake as they have the provision for the Oil fill tube but, the prices have gone crazy. They're basically like a Edelbrock RPM Intake.
http://www.collectorcarsforsale.com/...0497685800.jpg
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