Nice score dude. I have an 85, but I have updated her all the way around. If she is running good, drive her as long as you can and start saving and acquiring Ej stuff to swap over. More parts and more power, better driving, in my opinion.
I have a whole front clip, "legacy struts and engine mount" with a 4" lift on my Brat. I have the 2.2T in mine. Close to firing her off. I took the original brat motor and transferred her into my 88 Rx. I have always like how reliable the ea-81 is, bummer you can't get engine parts for her anymore. No more oil pumps.
So drive her until she quits, or change to the ea-82, or better an Ej engine.
They only lack power and ground clearance.