Cats are bi-directional. I would recommend Moroso Spiral Flow mufflers. They come in 2.5 and 3.0 inch diameters. Very nice low rumble, not raspy or loud. Do you have side, or rear exhaust?
You typically want them very near the primaries. The G1 & 2 cars had them in the front of the sills, just where the turnouts went parallel to the centerline.
Hood (bonnett) pins? You have to find a relatively level, flat area on the inner fender well. You will need access to the bottom to spin the locknuts for height adjustment. You'll also need to look for a good area on the hood to drill thru the support structure. A dab of grease on top the pins...
This thread is for Gen 2, '96 and '97 blocks, but is still useful: https://www.viperalley.com/threads/any-spark-plug-experts-out-there.297877/page-3?post_id=4707407#post-4707407
Yes, the casting number can be decoded for date of manufacture. If the VIN matches, the door tag can tell you within 2 days of when the motor went in the car.
If you register in a county that is "Non-Attainment" for Ozone, they will still test you after the safety inspections go away. DC Performance in LA has been building high HP Vipers that meet strict CARB limits. A phone call would be a good Idea...
Slide the body into a lathe chuck and snug it down. Place a stiff round rod thru the clevis to stop the fork from rotating. That should unscrew it easily.
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