ok here is my problem. i have an 87 302 roller engine i am going to put in my 68. it is going to be carburated, so i want to use my timing cover from my 289 so i can use the mech fuel pump. but with the 302's orig timing chain and the fp ecentric, the ecentric hits the timing cover. so i put the timing chain from my 289 on the new 302 and the ecentric has plenty of room but the chain rubs the block down by the crank timing gear.