I have a 1988 Accord, its stock clearance is 6.3 inch, your Civic must be around 150mm (5.9 inches ).
Its more then enough, 13 inch tyres are standard on 1988 Civic, Check on below your driver side door for absolute specs, use good quality tyres like Dunlop , Continental, Yokohama. Bridgestone , Pirelli, Michelin or Goodyear, Kumho etc, even slightly used ones are lot better then new General and have correct size according to international standards.
I suggest you keep your tires properly inflated all the time.The psi rating written on tyre, also Check the condition of shocks and suspension. Genuine springs/Shocks may cost you more upfront but they are very beneficial in future and a very good investment for you Car's handling and ride quality.Never apply diesel or oil to suspension, it destroys the suspension in no time.
Check the silencer is properly fitted with the body to avoid contact on speedbrakers.
Use a small and light good quality Cng Cylinder like Faber or INFLEX 40Kg or 50Kg water capacity.
Always try to travel light with no extra load in car or luggage.
and Lastly PLEASEDO NOT use or convert Genuine Suspensions with Spacers or aftermarket high mounted shocks to increase ride Height as they will ruin the Steering/Handling/Braking Adversely and are not reliable at all in long term.
Man i also hav civic 90. i will suggest you to use...
1. 14 inch rims with 185/70 R14 tyres... or
2. 15 inch rims with 195/65 R15 tyres..
i m using option no. 1 in my car with spacers installed in all shockers. if u r running the stock engine, then no. 1 choice is the best one. and if u hav swaped any d15 or d16 whatever, so use the secong option and dont increase the tyre size. and if u dont hav installed spacers for cng then with no. 1 option, the tyre size would be 185/65 R14. and with option 2, size wud be 195/60 R15.
I m an Automobile Technicianin toyota southern motors karachi. and i maintain my car myself. so, if u hav any trouble in ur car, u can contact me anytime after working hours.......
using an accord CA3 since forever and never had problems with clearance issues - for CF civics you need to accept that your car's clearance is low - dont try to muck around with it, it will change the whole steering geometry... - These cars are really amazing in handling when done properly,, dont ruin them
Does your bellypan scrape or your exhaust pipe, I had my exhaust redone properly about 8 years ago - never had a scraping problem since - all neatly tucked in the car - if my car scrapes its the belly pan scraping on large speed bumps