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I would put the 5 speed in and get rid of the auto , the last post is exactly right in the split years . the FA manual will fit in the stock tunnel hole and the FB needs to be shortened 103mm .If the twin dizzy is stuck the first gen motor is a better fit .I have 2 73 rx2s and it can pose as a problem ,you need to play with the rx2 and rx7 motor mounts as they are different in the motor set back .Trans mounts are easy to make so that might be a must ,also check your pinion angle (stock) and see what the difference is with the rx7 stuff . you want the angles to match so you don't pre maturely wear your drive shaft bearings.A ll the rx2 to rx7 mods are a pain in the ass but the rx7 stuff is better for the horse power (more solid ) .Even the threads on the brake lines is different . Time and cation is the biggest part of the build .
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