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Id say temporarily remove the gear vendors overdrive and put the original tail shaft housing and original driveshaft back in. That is of course if you still have those items.
Quote: "Sorry, not quite sure what you mean about doing an on-car wheel balancing? I did swap out all the wheels for a different set of wheels from my 70 Road Runner (that run fine on that car)."
Here is a short vid on YouTube doing the rears on an earlier Vette:
I have been watching HawkRod's project as the posts are updated. The issue that the car has vibration issues and has a Gear Vendors overdrive was what I took particular note of. Whether those two points are related remains to be seen. I've read everything I could find on the internet about...
HawkRod, As noted there isn't much left to change or redo. However if you are using any kind of polyurethane mount/bushing anywhere this might be something to look into. Motor mounts, trans mount, torsion bar crossmember mount, k-frame bushings, etc. Any of these could transfer a vibration...
I'd recommend modifying/using this voltmeter. I used the Sunpro version that had the needle swing the opposite way for my application. https://www.ebay.com/itm/SUNPRO-CP8215-VOLTMETER-GAUGE-2-MECHANICAL-12-VOLT-INTERNAL-LIGHTING/303717159213?epid=13017013683&hash=item46b6f4112d:g:MZoAAOSwqY5ffS7B
I've been running this exact 270/470 Comp cam in my low compression 400BB for 15 years now. It's in my 1975 Coronet 2 door. A heavy car I'm guessing to be at 4000 lbs plus in weight. I did go with a 2500 stall and 3.90 gears. Runs good for what it is. Does good burnouts from a slow roll. Has...