Running a 46rh ,, 518 in my 68 Charger, yes I know its not an E body :), 512 lowdeck, it is one of the best things I did to my junker, I had to trim the upper part of the torsion bar x member & build a custom trans x member. I converted my stock shifter to a cable. mine is also a lock up converter 4.1 gear

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1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5