Hey guys i wana change my fuel filter today on the 86 cuz the shop that was puttin the headers on said it looked like the stock original one. but i also wana change my oil and check my timing, anyone know what it should be at original, and what a good advanced time is cause i wana see where its at now and if i should advance it. also wanna change my oil out and had a question about that, should i do a royal purple change on an onlder high mileage engine? when i bought the car i was told it was rebuilt maybe 40-50k miles earlier but who knows if thats true or not alota people say that just to sell the car. Thanks in advance, i have some time and help today and wanted to see if i could get her running a little better. oh and will the fuel filter help gas miles, i seriously get about 9-10mpg in it and its only mildly modded.. just tuned it up a month ago adn its only got e303cam high flow h pipe, flowmaster catbacks, cold air intake, shorti headers, and deleted smog pump.. just trying to figure out what the deal is with that i know i could get better gas