I am using a 4l80e flexplate and adapter bushing on the 5.3 to th400. Bolts to my TCI 9.5" converter perfectly.
Pretty sure they still make the front cover as Ive seen em for sale on pace performance and scoggin dickey. The MSD box is pn 6010
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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