These work great. I have used them to bring up the rear many times.http://www.summitracing.com/parts/EXP-13120/
You will get about 2" of height. Could be a little more on an A body. Take about 2 or 3 hours.
You should be able to overcome the 1 3/8" difference by dropping it from 13.8" and letting it free full into the car. Its just a simple math equation I worked out.
Take fine die 1/2" I think. Out of your tap & die set and chase the threads. When you get the die to go easy forwards turn it over and chase it the other way. Tighten the nuts up so you can get the most threads.