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What exactly is the layout of the car you are proposing? Front engine rear drive? If you are trying to do rear or mid engine with rear drive, the length of any setup is to long IMO. There are cars built that way but they are longer drag race type cars and not as manuverable, and not well suited for topping dunes, etc. I also don't know what terrain your targeting.In the drag race world, a super common setup is any motor coupled to a powerglide 2 speed that has no tail shaft just an adapter, then a splined coupler is used between the tranny and the solid mounted 3rd member. This setup is about as short as you can get with an OE tranny and rearend setup, but is still two long IMO for an agile car. I would estimate it is 30" from the front of the tranny to the axle centerline. Fabr could give us the actual number. Hint Hint.IMO either of the motors you mentioned would work well with an 091 bus tranny, Adapters would be readily available for either. Then you would have a common and very upgradeable transaxle while keeping the car proportions very well in line.After rereading some of your posts, I may be way out of line with the direction of my response, but physical packaging was always the downfall of any nontraditional drivetrain ideas that I came up with.