Want to put a magnum 5.9 in my 70 dart.

Yeah I ran into this with a magnum based motor recently. If he decides to go 904 you gotta pay $$$ for a flex plate. I tried the stock magnum flexplate but it wouldn’t fit my PTC converter. Something for him to keep in mind if he is going with an aftermarket torque converter.

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And that will also depend on whether EFI is retained- then the stock flexplate MUST be used for its crank sensor slots.