Moser will build a B body 12 bolt with correct brackets, true track, 308, for right about $3k.
Here's Spohn's build sheet:
https://www.spohn.net/shop/1965-1970...-Rear-End.html
Quick Performance will do a 9" housing/axle package with correct brackets for about $1k:
https://www.quickperformance.com/QP-...e_p_22644.html
You can get them to do the hybrid Moser ends for a few bucks more, add a 3rd member with posi for less than $1500.
https://www.quickperformance.com/For...mber_p_36.html
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song:
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