What octane fuel is best for my car?

[lx mike]

benefits of timing increase are a few hp but can't say how muc every car is diffeerent, only risks are if you go too far or don't have enough octane and engine will detonate. to "bumb" your timing firsr find the balancer and there should be lines there with a 10 and a 20 with smaller lines between them, get some chalk or a white marker and highlight between there, then next to the distrbutor is a short set of wires with a grey plug in there pull it out and put it in your pocket so you don't loose it! loosen distributor hold down you'll need a long extension and a swivel to get to the holddown bolt loosen just enough so you can move it with a little effort but not so looose that it turns too easy. hookup timing light and start car and aim at balancer and see what your timing is. try setting it around 13-15 degrees which would be about half way between the 10 and 20 marks. tight dist hold down and check again to make sure it didn't move and then shut off car, put back in the plug and take for a ride and see how it feels.