1-5-3-6-2-4 Looking from the cooling fan side.
The firing order should be 1-5-3-6-2-4.
1-5-3-6-2-4
The order is 1-5-3-6-2-4
1-5-3-6-2-4
1-5-3-6-2-4
for all 258 CID engines the firing order is 1-5-3-6-2-4. Cylinder one is the front by the radiator and on the distibutor cap, plug one wire should go to the socket closest to the passenger fender, then the rotation is clockwise as viewed from the top.
1-5-3-6-2-4 rotor turns clockwise.
http://edits.zwinky.com/zwinkyeditsv2/wardrobe.jhtml?form=desktop&u=your sn here!!&ck=258&v=87
258% of 100 = 258% * 100 = 2.58 * 100 = 258
129, 258, 387, 516, 645 and so on.
258% is 258/100 (so a value of 258% is a multiplication by 2.58)
258 / 0.60 = 258 / (6/10) = 258 / (3/5) = 5 * 258 /3 = 5 * 86 = 430