I have run into this multiple times on customer's cars that have D port Doug's headers and a 4 manual transmission. All the cars were using a factory bell housings though. What I have done is modifying the bell housing so that I can get a full size filter in there. I take a grinder and remove material till I can get it through the opening.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
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