4AF-E, 5A-FE,4EF-E and 5E-FE are bolt on swaps for EE80 to AE series
Swap will work like a charm and @Sinner is using 5A-FE for almost 6 years now and there is some work in the Wiring else no alteration needed to swap!
if u want AVG then go for 4E-FE its 1.3l with almost 85-90hp and u can use it on CNG
Also u can swap 7AF-E its 1.7l
plus all the engines i mentioned work like a charm on CNG
and for steering rack aka "sterring baksa" there is a guy im not sure he as it for not he is in Tehkal same plaza of Nawaz tape repair i used to get Kabuli items from him and come with a garunite of 1 to 2 weeks.