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It really depends on what type of front end your using. If you have the straight axle, the oil pan with the sump in the front (early 289) should work because the straight axle and steering tie rod sits further back. If your running a Mustang II or IFS type suspension, you might have to go with the sump to the rear type pan. Since you already have the C4 transmission and it's in good shape, why not use it? The C4 would probably be stronger than the original 40 transmission. It's a matter of making a transmount and modifying the driveline. I wouldn't go with a 8 inch Ford for two reasons. They break and gear selection is much more difficult to find than the 9 inch Ford rearend which is readily available. If your going to all that work of changing the rearend. Might as well go with a popular and easy to find parts 9 inch Ford. It's only an opinion. You have several options to go with...
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