Spend the money do the t5..
You get no benifit by adding the 4 speed except for a cool floor shifter and a extra shift with the final output still 1:1
The t5 you get the cool floor shifter and two extra shifts but a final gear of .65:1 or .78:1 depending on v8 vs. 4 cyl trans.
The modern driveline kit makes the swap easy but its $$$
If it were me id use stock falcon bell , modern driveline adapter, stock 4 cylinder mustang t5 (easier to find and cheaper), falcon parts c4 trans mount, cut and shorten drive shaft and enjoy..
The t5 makes the 170 fun.. next you'll want the 200
Nathan and Jen Cooper
63 Sprint Hardtop "Dollora"
63 Super deluxe squire wagon "Mayble"
* this spot is vacant for future project*
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